Welcome to the 2014 ACR Webinar Series!!

Transcription

1 Arkema Coating Resins Welcome to the 2014 ACR Webinar Series!! Invest one hour with us and we ll help you grow your business with products and technology from Arkema Coating Resins August 15, 2014

2 2014 ACR Webinar Series Today s Topic: Pressure Sensitive Adhesives Speaker: Keith Andes Title: Technical Service Chemist

3 Our training goal Give you the knowledge necessary to answer your customer s questions concerning pressure sensitive adhesives with confidence Define the categories of PSA Describe industry testing protocols Outline the characteristics of the different product classifications Highlight several Arkema products and describe their performance benefits 3

4 Today s Agenda What is a Pressure Sensitive Adhesive? North American PSA Market PSA Product Categories PSA Performance Testing Waterborne PSA Compounding ACR product line overview and product spotlight Recap 4

5 5 What is a Pressure Sensitive Adhesive?

6 Pressure Sensitive Adhesives Definition: Pressure Sensitive Adhesives (PSA) are polymeric materials that can form a physical bond with another material upon brief contact and with light pressure. 6

7 PSA performance is dictated by its ability to bond and debond All PSA applications involve bond formation and debonding steps Bond formation is the result of a polymeric material being able to flow and wet under light pressure establishing a contact area with the substrate. Debonding involves deformation of the material under stress, followed by separation from the substrate

8 8 Adhesive bond formation requires the PSA to flow like a liquid upon application

9 9 Adhesive debonding or peel strength requires the PSA to behave like a solid

10 PSAs are Viscoelastic Materials Silly Puddy, although NOT a PSA, is a real world example of materials that exhibit both solids and liquid behavior Over long periods of time it exhibits viscous behavior (liquid) Short time periods of time it exhibits elastic behavior (solid) 10

11 11 Pressure Sensitive Adhesives are everywhere

12 Pressure Sensitive Adhesives offer many advantages over other types of adhesives No need to apply moisture or heat High application speed Controlled thickness Cushion/gap filling effects Tack allows prepositioning Die Cut Shapes 12

13 but they are not without their drawbacks PSA bonds are not totally permanent Sensitive to surface contamination Usually sensitive to temperature 13

14 Water-borne PSA offer additional advantages Requires no solvent incineration or recovery equipment Works with a wide variety of materials Lower cost than solvent-borne systems 14

15 ..but Water-borne PSA have additional limitations Difficult to coat due to high surface tension needs surfactants (coating package) Lower adhesion to some lower surface energy surfaces such as polyolefins Performance not equal to solvent systems More difficult to dry than solvents 15

16 16 North American PSA Market

17 17 Waterborne is the dominant technology and tapes the largest segment

18 18 Industrial has the largest share of the NA tape market, but healthcare delivers the greatest value

19 19 PSA is a large and growing segment in the NA label market

20 20 Specialty applications account for 20% of the total PSA market

21 21 PSA accounts are located primarily on the east coast and in the upper midwest

22 22 PSA Product Categories

23 PSA can be categorized numerous ways By chemistry By end-use application By adhesive properties 23

24 By Chemistry: Water Based (Emulsion) Advantages Requires no solvent incineration or recovery equipment Works with a wide variety of materials Lower cost than solvent systems Disadvantages Difficult to coat due to high surface tension needs coating package (surfactants) Lower adhesion to some surfaces lower surface energy surfaces such as polyolefins Performance not equal to solvent systems More difficult to dry than solvents 24

25 By Chemistry: Solvent (Solution) Advantages Easy to vary solids, viscosity, and drying rate No concern about freeze/thaw Can use a wide variety of modifiers/catalysts Excellent coating quality Wide variety of molecular weights Can be formulated for superior peel, tack and shear balance Disadvantages Flammable/ safety concerns Recovery/ disposal issues of solvent costly capture or incineration equipment required Health and exposure issues 25

26 By Chemistry: 100% Solids (Hot Melt and UV Reactive) Advantages No oven/ drying required No solvent recovery required Very high coating speeds possible Disadvantages Limited formulations UV capital equipment is expensive 26

27 By End-Use: Filmic and paper labels Labels are a key element of package design Product branding, nutritional information, use instructions, etc. PSA contributes very little to overall packaging cost but are indispensible 27

28 By End-Use: Decorative and protective laminates Over-laminate films are low cost options for improving the durability and aesthetics of any substrate They can either be permanently applied or easily removable 28

29 By End-Use: Tapes Tapes are perhaps the most familiar embodiment of a product employing PSA Mixing different combinations of facestock and PSA offers almost unlimited product design possibilities The PSA employed is specific to each end use Medical, electrical, masking, etc. 29

30 By Adhesive Properties: Grades Permanent most common type with high ultimate adhesion. Removal results in destructive failure (tearing substrate or backing). Removable relatively high cohesive strength and low ultimate adhesion. Removed easily from most substrates without leaving a residue. Repositionable low adhesion initially which builds over time allowing for corrections to be made if labels are not applied properly. 30

31 By Adhesive Properties: Permanent Typical Adhesive Properties Initial peel adhesion above 2.0 lb/in. Peel adhesion typically builds over time. Loop tack values above 1.0 lb/in Shear values 1 to 10 hours Can be base acrylic latex or tackified through formulation Typical applications include labels, packaging tape, and over-laminates. 31

32 By Adhesive Properties: Removable Typical Adhesive Properties Initial peel adhesion less than 2.0 lb/in (typically 1.0 lb/in). Peel adhesion does not increase with time. Loop tack values below 1.0 lb/in Shear values 10+ hours (can be much higher) Can be base acrylic latex or cross-linked through formulation Typical applications include temporary notes, labels, wall coverings, signage and surface protection. 32

33 By Adhesive Properties: Repositionable Typical Adhesive Properties Initial peel adhesion less than 2.0 lb/in (typically 1.0 lb/in). Similar to removable PSAs. Once applied, the adhesion builds significantly over time and becomes somewhat permanent. Peel adhesion builds roughly 200% or greater after 24 hours. Shear values 10+ hours (can be much higher) Can be base acrylic latex or cross linked through formulation Typical uses include critical label applications. 33

34 34 PSA Performance Testing

35 Three key performance properties Peel resistance (adhesion) Tack (initial adhesion or grab) Shear resistance (cohesive strength) 35

36 Sample preparing can influence performance Coat weight Must be specified and can be given in various units (g/1000m 2, lbs/ream, mils thickness) Direct or indirect coating Direct coating onto facestock Indirect coating onto low surface energy release liner Facestock Can influence adhesive properties and must be specified by end-user Substrate Innumerable Standard substrates include paper, films, metals, glass 36

37 Sample preparation Sample Prep Video 37

38 PSA Performance Testing - Peel Adhesion The force required to remove a PSA-coated flexible material from a specified test surface under standard conditions. Method of Measurement 180 o peel test (PSTC-1): A 1 inch wide strip of PSA coated material is applied to a stainless steel plate under a determined pressure and allowed to dwell for a specific amount of time. Effect on Application Will determine end use such as removable, permanent or repositionable. 38

39 180 o Peel Adhesion (PSTC -1) Peel Video 39

40 PSA Performance Testing - Loop Tack The resistance offered by an adhesive film to detachment from a substrate, it is the ability to form an instant bond when brought into low pressure contact with a substrate. Also called: wet tack, quick stick, initial adhesion, finger tack, thumb tack, quick grab and quick adhesion. Method of Measurement Loop tack test (PSTC-16): measure of the force required to remove a standard adhesive coated film loop from a stainless steel plate after a short contact in the absence of pressure Effect on Application Initial tack is critical to most PSA applications especially hard to stick to substrates such as polyolefin substrates, corrugated cardboard and non-uniform shapes such as bottles. 40

41 Loop Tack (PSTC-16) Tack Video 41

42 PSA Performance Testing - Shear Resistance The force required to pull the pressure sensitive material parallel to the surface to which it was affixed. Also called: cohesive strength, stiffness of adhesive Method of Measurement Shear strength (PSTC 7) measure of the time required for a statically loaded PSA sample to separate from a standard flat surface in a parallel direction to the surface to which it was affixed with standard pressure Effect on Application Increased cohesive strength improves die cutting by reducing ooze and gumming of adhesive on blades Reduces bleeding and migration of latex on substrate Needed for removable labels 42

43 Shear Resistance (PSTC-7) Shear Video 43

44 Relationship between Peel Adhesion and Cohesive Strength In general, as peel adhesion increases shear adhesion decreases. Aggressive Peel and Tack High Cohesive Strength Humidity Resistance Tack Peel Humidity Resistance Tack Peel Shear Low Temp Tack Shear Low Temp Tack Adhesive properties controlled by Mw, T g, X-linking and chemistry 44

45 45 Waterborne PSA Compounding

46 Water Based PSA can be formulated with other materials to improve adhesive properties or application characteristics Base latex (Acrylic, ST-Acrylic, SBR ) Compounding additives Resins/ tackifier Plasticizers Fillers UV stabilizers Anti-oxidants Rheology modifiers (thickeners) Surfactants Defoamers Biocides 46

47 Compounding additives: Resins/ Tackifiers Primary purpose: Added to promote tack Mechanism: Low molecular weight polymers increase tack by improving cold flow and wet out of dry adhesive. Types of tackifers: For acrylic polymers: rosin esters, pure aromatics For SBR polymers: rosin esters, pure and petroleum aromatics, alpha pinene terpenes For natural rubbers: petroleum aliphatics anad aromatics, terpenes, rosin esters Tackifiers are selected based on their compatibility with the base latex and desired performance properties 47

48 Compounding additives: Plasticizers Primary Purpose: improve adhesive flow and wet out Types of plasticizers Mineral oil Liquid polybutenes Liquid polyesters 48

49 Compounding additives: Stabilizers Primary Purpose: protect adhesive from degradation from light or oxygen UV stabilizers: Hindered amines Antioxidants Hindered phenols 49

50 Compounding additives: Rheology Modifiers Primary purpose: to improve processing/ converting of the wet latex by optimizing low and high shear viscosity Types of thickeners: Polyvinyl alcohol (neutral ph) Cellulosic derivatives (neutral ph) Natural gums (neutral ph) HASE: Hydrophobic Alkali Swellable Emulsions (basic ph) Polyurethane associative thickeners 50

51 Compounding additives: Fillers Primary Purpose: To reduce tack and adhesion, impart opacity, improve converting (dye cutting) Types of fillers Calcium carbonate Titanium dioxide Zinc oxide Aluminum silicates (clays) Pigments Fillers will impact viscosity based on size, shape and quantity 51

52 Generic Water Based Formulation Polymer 60-80% Resins/tackifiers 20-40% Plasticizers 0-40% Fillers 0-10% Other 1-2% Stabilizers Thickeners Defoamers Surfactants 52

53 Pressure Sensitive Adhesives PSA are used in the manufacture of tapes, labels and over-laminate films They can be supplied as either waterborne latexes, solventborne solutions or 100% solids hot melts, with waterborne being the largest type In North America labels are the largest consumers of PSA Labels can be categorized as either paper, filmic or metallic based on the face stock type Label adhesives types can be further subcategorized based on their adhesive properties (i.e. permanent, removal repositionable) and the conditions under which they will be used The primary adhesive properties are peel strength, tack and shear adhesion 53

54 54 ACR Product Overview

55 ENCOR PSA Selection Guide LABEL General Purpose Clear and Paper ENCOR 9466 ENCOR 9144 Water Resistant Filmic ENCOR 9285 Low/ All Temperature ENCOR 9569 OVER-LAMINATE ENCOR 9291 TAPE ENCOR

56 ACR Pressure Sensitive Adhesives Product LABELS - PERMANENT Chemistry Total solids (%) T g ( o C) ENCOR 9165 Acrylic Features Base latex for general purpose filmic labels ENCOR 9290 Acrylic EnVia; coater-ready all purpose PSA ENCOR 9466 Acrylic General purpose label ENCOR 9285 Styrene acrylic LABELS - ALL TEMPERATURE PERMANENT ENCOR 9569 Acrylic TAPES ENCOR 9801 Acrylic Packing tapes EnVia; coater-ready adhesive for clear, water-resistant labels Label and tapes for low energy substrates; ambient to sub-freezing temperatures OVER-LAMINATE FILMS ENCOR 9291 Acrylic High speed gravure direct coating of treated films 56

57 57 Pressure Sensitive Adhesive Product Spotlight

58 58 More detailed information available in product literature

59 ENCOR 9466 High Solids General Purpose PSA 59

60 ENCOR 9466 has an excellent balance of adhesive properties Value Proposition Highly versatile product that allows our customers the ability to formulate high clarity, permanent paper and filmic labels Product Overview Features High solids with low viscosity Excellent balance of peel, tack and cohesive strength Cleaner converting due to low surface tension and high cohesive strength Very good adhesion to low surface energy substrates Exceptional tackifier response High line speed capability FDA 21 CFR compliance EnVia compliant 60

61 ENCOR 9466 can form the basis of a range of products ENCOR % low MP tackifier 30% high MP tackifier All temperature Neat Aggressive tack and peel General purpose permanent (GPP) 61

62 ENCOR 9466 can be formulated to alter application window GPP PSA ENCOR 9466 All Temp PSA PSA with aggressive tack and peel ENCOR 9466 with low MP tackifier ENCOR 9466 with high MP tackifier 62

63 ENCOR 9569 For All-Temperature Permanent Label and Tape Applications 63

64 ENCOR 9569 yields good low temperature adhesion Value Proposition Allows our customers the ability to formulate for alltemperature permanent label and tape applications Excellent for blending with higher Tg harder polymers that need an increase in tack. Product Overview Features Outstanding color and clarity on clear face stocks Excellent peel and tack Superior adhesion to a wide variety of surfaces Excellent flow and leveling Conformance to FDA 21CFR Good adhesion down to -10 F on a wide variety of surfaces 64

65 ENCOR Peel 3.7 lbs/in Loop 3.0 PSI Shear 0.75 hrs

66 66 Good low temperature tack key to ENCOR 9569 performance in this application

67 ENCOR 9285 For Clear, Water Resistant Labels 67

68 ENCOR 9285 demonstrates excellent waterwhitening resistance Value Proposition Allows our customer to formulation adhesives for clear bottle labels that have excellent water-whitening resistance Product Overview Features Excellent clarity and water whiteness Excellent balance of peel, tack and cohesive strength Adhesion to a wide variety of surfaces Excellent blush resistance Conformance to FDA 21CFR

69 69 ENCOR 9285

70 ENCOR 9285 displays superior water whitening resistance ENCOR 9285 STD PSA Open-faced films after 24 hrs immersion in water 70

71 Summary Highlights of Today s Webinar 71

72 Recap Today s session was intended to provide you with a technical grounding in pressure sensitive adhesive testing and product selection ACR offers products for use in label, over-laminate and tape applications ENCOR 9466 has an excellent balance of adhesive properties for general purpose PSA labels ENCOR 9569 yields good low temperature adhesion for freezer grade PSA labels ENCOR 9285 displays superior water whitening resistance for use as a PSA for beverage bottle labels 72

73 Questions? Please contact the Account Team Commercial Questions Latin America Commercial Questions USA & Canada Technical Questions Marlene Hernandez Mark Piggott Mary Chervenak 73

74 2014 ACR Webinar Series Today s Topic: Architectural Coatings Speaker: Neal Rogers Title: Technical Account Coordinator Friday September 19, 2:00pm ET

75 Arkema Coating Resins Thank You for Joining Us!! See you in September!! 75