Blends of block copolymer and acrylic adhesives

Patent metadata

Field	Value
Publication number	US-9556367-B2
Application number	US-201414484952-A
Country	US
Kind code	B2
Filing date	Sep 12, 2014
Priority date	Dec 7, 2006
Publication date	Jan 31, 2017
Grant date	Jan 31, 2017

Abstract

Pressure sensitive adhesive compositions containing 92 to 99.9 parts of a block copolymer adhesive composition and 0.1 to less than 8 parts of an acrylic adhesive composition are described. Tapes including such adhesives, and methods of making such tapes are also described.

First claim

What is claimed is:

1. A pressure sensitive adhesive composition comprising:
(A) 92 to 99.9 parts of a block copolymer adhesive composition comprising:
(a) a first block copolymer comprising
(i) at least one rubbery block comprising a first polymerized conjugated diene, a hydrogenated derivative thereof, or combinations thereof; and
(ii) at least one glassy block comprising a first polymerized monovinyl aromatic monomer; and

(B) 1 to less than 8 parts of an acrylic adhesive composition comprising:
(i) 70 to 100 parts of at least one acrylic or methacrylic ester of a non-tertiary alkyl alcohol, wherein the non-tertiary alkyl alcohol contains 4 to 20 carbon atoms; and
(ii) 10 to 30 parts of a copolymerized reinforcing monomer.

2. The pressure sensitive adhesive according to claim 1 , wherein the first block copolymer is a multi-arm block copolymer of the formula Q n -Y, wherein:
(a) Q represents an arm of the multi-armw block copolymer and each arm independently has the formula R-G, wherein:
(i) R represents the rubbery block; and
(ii) G represents the glassy block;

(b) n represents the number of arms and is a whole number of at least 3; and
(c) Y is a residue of a multifunctional coupling agent.

3. The pressure sensitive adhesive according to claim 2 , wherein the block copolymer adhesive composition further comprises (b) a second block copolymer comprising at least one rubbery block comprising a polymerized second conjugated diene, a hydrogenated derivative thereof, or combinations thereof and at least one glassy block comprising a second polymerized monovinyl aromatic monomer.

4. The pressure sensitive adhesive according to claim 3 , wherein the second block copolymer is a linear block copolymer.

5. The pressure sensitive adhesive according to claim 4 , wherein the second block copolymer is a copolymer selected from the group consisting of styrene-isoprene-styrene, styrene-butadiene-styrene, styrene-ethylene-butadiene-styrene, and combinations thereof.

6. The pressure sensitive adhesive according to claim 4 , wherein a ratio of multi-arm block copolymers to linear block copolymers ranges from 1.5:1 to 9:1.

7. The pressure sensitive adhesive according to claim 4 , wherein the first block copolymer is a polymodal, asymmetric star block copolymer.

8. The pressure sensitive adhesive according to claim 4 , wherein the block copolymer adhesive composition further comprises a first high Tg tackifier having a Tg of at least 60 degrees C., wherein the first high Tg tackifier is compatible with at least one rubbery block.

9. The pressure sensitive adhesive according to claim 8 , wherein the block copolymer adhesive composition further comprises a second high Tg tackifier having a Tg of at least 60 degrees C., wherein the second high Tg tackifier is compatible with the at least one glassy block.

10. The pressure sensitive adhesive according to claim 8 wherein a ratio of a total amount of high Tg tackifiers to block copolymers ranges from 0.8:1 to 1.25:1.

11. The pressure sensitive adhesive according to claim 8 wherein a ratio of the rubbery block compatible high Tg tackifier to the glassy block compatible high Tg tackifier ranges from 1:1 to 9:1.

12. The pressure sensitive adhesive according to claim 1 , wherein the first block copolymer is a polymodal, asymmetric star block copolymer.

13. The pressure sensitive adhesive according to claim 1 , wherein the block copolymer adhesive composition further comprises a first high Tg tackifier having a Tg of at least 60 degrees C., wherein the first high Tg tackifier is compatible with at least one rubbery block.

14. The pressure sensitive adhesive according to claim 13 , wherein the block copolymer adhesive composition further comprises a second high Tg tackifier having a Tg of at least 60 degrees C., wherein the second high Tg tackifier is compatible with the at least one glassy block.

15. The pressure sensitive adhesive according to claim 13 wherein a ratio of the total amount of high Tg tackifiers to block copolymers ranges from 0.8:1 to 1.25:1.

16. The pressure sensitive adhesive according to claim 13 wherein a ratio of the rubbery block compatible high Tg tackifier to the glassy block compatible high Tg tackifier ranges from 1:1 to 9:1.

17. A tape comprising a foam backing having a first major surface and a second major surface; and a first adhesive skin bonded to the first major surface, wherein the first adhesive skin comprises a first pressure sensitive adhesive comprising
(A) 92 to 99.9 parts of a block copolymer adhesive composition comprising:
(a) a first block copolymer comprising
(i) at least one rubbery block comprising a first polymerized conjugated diene, a hydrogenated derivative thereof, or combinations thereof; and
(ii) at least one glassy block comprising a first polymerized monovinyl aromatic monomer; and

(B) 1 to less than 8 parts of an acrylic adhesive composition comprising:
(i) 70 to 100 parts of at least one acrylic or methacrylic ester of a non-tertiary alkyl alcohol, wherein the non-tertiary alkyl alcohol contains 4 to 20 carbon atoms; and
(ii) 10 to 30 parts of a copolymerized reinforcing monomer.

18. The tape of claim 17 , wherein the first block copolymer is a multi-arm block copolymer of the formula Q n -Y, wherein:
Q represents an arm of the multi-arm block copolymer and each arm independently has the formula R-G, wherein:
(i) R represents the rubbery block; and
(ii) G represents the glassy block;

n represents the number of arms and is a whole number of at least 3; and
Y is a residue of a multifunctional coupling agent; and

wherein the block copolymer adhesive composition further comprises (b) a second block copolymer comprising at least one rubbery block comprising a polymerized second conjugated diene, a hydrogenated derivative thereof, or combinations thereof; and at least one glassy block comprising a second polymerized monovinyl aromatic monomer, and wherein the second block copolymer is a linear block copolymer.

19. A pressure sensitive adhesive composition comprising:
(A) 92 to 99.9 parts of a block copolymer adhesive composition comprising:
(a) a first block copolymer comprising
(i) at least one rubbery block comprising a first polymerized conjugated diene, a hydrogenated derivative thereof, or combinations thereof; and
(ii) at least one glassy block comprising a first polymerized monovinyl aromatic monomer; and

(B) 1 to less than 5 parts of an acrylic adhesive composition comprising:
(i) 70 to 100 parts of at least one acrylic or methacrylic ester of a non-tertiary alkyl alcohol, wherein the non-tertiary alkyl alcohol contains 4 to 20 carbon atoms; and
(ii) 10 to 30 parts of a copolymerized reinforcing monomer.

Assignees

• 3M Innovative Properties Co

Inventors

• Waid Robert D
• Zoller Panu K
• Gadbois Gregory B

Classifications

• B29K2105/0085

  Copolymers · CPC title

• B32B3/26

  characterised by a particular shape of the outline of the cross-section of a continuous layer; characterised by a layer with cavities or internal voids {(foam layer B32B5/18; layer of synthetic resin characterised by fillers that create voids or cavities B32B27/205); characterised by an apertured layer} · CPC title

• B32B7/12

  using interposed adhesives or interposed materials with bonding properties · CPC title

• B32B27/065

  of foam · CPC title

• C08L2205/02

  containing two or more polymers of the same C08L -group · CPC title