TACKY RESIN COMPOSITION AND PRESSURE-SENSITIVE ADHESIVE FILM OR SHEET

• US 20100317802A1
• Filed: 01/28/2009
• Published: 12/16/2010
• Est. Priority Date: 02/05/2008
• Status: Active Grant

• Current Assignee: Du Page Medical Group Limited
• Original Assignee: Du Page Medical Group Limited
• Inventors: Hironaka, Yoshitaka, Gonohe, Hisao, Aoyama, Masataka
• Granted Patent: US 8,497,321 B2
• Time in Patent Office: Days
• US Class Current: 525/190
• CPC Class Codes: C08L 23/0853 Vinylacetate
• CPC Class Codes: C08L 23/10 Homopolymers or copolymers of propene
• CPC Class Codes: C08L 2666/02 Organic macromolecular compounds, natural resins, waxes or and bituminous materials
• CPC Class Codes: C08L 53/02 of vinyl-aromatic monomers and conjugated dienes
• CPC Class Codes: C09J 2203/306 for protecting painted surfaces, e.g. of cars
• CPC Class Codes: C09J 2423/00 Presence of polyolefin
• CPC Class Codes: C09J 2453/00 Presence of block copolymer
• CPC Class Codes: C09J 7/22 Plastics; Metallised plastics
• CPC Class Codes: C09J 7/38 Pressure-sensitive adhesives [PSA]
• CPC Class Codes: Y10T 428/2891 including addition polymer from alpha-beta unsaturated carboxylic acid [e.g., acrylic acid, methacrylic acid, etc.] Or derivative thereof

Abstract

A tacky resin composition which has proper initial tackiness, is sufficiently inhibited from rising in tackiness with time, can keep tackiness at a proper range even when it receives a slight heat history or is stored for a long time, has very small dependence on peeling speed, and can provide high transparency to a pressure-sensitive adhesive film or sheet as required, and a pressure-sensitive adhesive film or sheet for the surface protection of an article, which is obtained form the tacky resin composition.

The tacky resin composition comprises (A) 5 to 80 parts by weight of an olefin polymer (component A), (B) 5 to 80 parts by weight of an ethylene/unsaturated ester copolymer (component B) and (C) 1 to 60 parts by weight of a styrene-based elastomer and/or an olefin-based elastomer (component C) based on 100 parts by weight of the total of the components A, B and C.

Claims

1. A tacky resin composition comprising (A) 5 to 80 parts by weight of an olefin polymer (component A), (B) 5 to 80 parts by weight of an ethylene/unsaturated ester copolymer (component B) and (C) 1 to 60 parts by weight of a styrene-based elastomer and/or an olefin-based elastomer (component C) based on 100 parts by weight of the total of the components A, B and C.

2. The tacky resin composition according to claim 1, wherein (A) the content of the olefin polymer (component A) is 7.5 to 75 parts by weight, (B) the content of the ethylene/unsaturated ester copolymer (component B) is 7.5 to 75 parts by weight, and (C) the content of the styrene-based elastomer and/or the olefin-based elastomer (component C) is 1 to 49 parts by weight based on 100 parts by weight of the total of the components A, B and C.

3. The tacky resin composition according to claim 1 or 2, wherein the component A is a propylene-based (co)polymer having a melting point of 130°

C. or higher.

4. The tacky resin composition according to claim 1 or 2, wherein the component A is an ethylene-based (co)polymer having a density of 896 to 965 kg/m³.

5. The tacky resin composition according to claim 1, wherein the component C is a styrene-based elastomer.

6. The tacky resin composition according to claim 5, wherein the styrene-based elastomer is a styrene-ethylene/butene-styrene block copolymer (SEBS) which is a hydrogenated product of a styrene-butadiene-styrene block copolymer (SBS) or a styrene-ethylene/propylene-styrene block copolymer (SEPS) which is a hydrogenated product of a styrene-isoprene-styrene block copolymer (SIS).

7. The tacky resin composition according to claim 1 which further comprises a tackifier.

8. Use of the tacky resin composition of claim 1 as an adhesive.

9. A pressure-sensitive adhesive film or sheet comprising a pressure-sensitive adhesive layer formed from the tacky resin composition of claim 1.

10. A pressure-sensitive adhesive film or sheet which comprises a pressure-sensitive adhesive layer formed from the tacky resin composition of claim 1 and has small dependence on peeling speed of adhesion/peel strength.

11. A pressure-sensitive adhesive film or sheet having a pressure-sensitive adhesive layer formed from the tacky resin composition of claim 1 on at least one side of a base layer.

12. The pressure-sensitive adhesive film or sheet according to claim 11, wherein the base layer is a film or sheet made of an ethylene-based polymer or a propylene-based polymer.

13. A surface protection film or sheet which is the film or sheet of claim 11.

14. Use of the pressure-sensitive adhesive film or sheet of claim 9 for the surface protection of an article.