Block copolymer blend adhesives with multiple tackifiers

Patent metadata

Field	Value
Publication number	US-9458359-B2
Application number	US-51481407-A
Country	US
Kind code	B2
Filing date	Nov 15, 2007
Priority date	Dec 7, 2006
Publication date	Oct 4, 2016
Grant date	Oct 4, 2016

Abstract

Pressure sensitive adhesives comprising a linear block copolymer having a rubbery block and at least one glassy block; a multi-arm block copolymer having at least three arms, each having both a rubbery block and a glassy block; a first high glass transition temperature tackifier compatible with the rubbery blocks; a second high glass transition temperature tackifier having compatible with the glassy blocks; and at least one of a low Tg tackifier, a plasticizer, and combinations thereof, are disclosed. Tapes that include such adhesive, methods of making such tapes, and bonded composites using such adhesives and tapes are also disclosed.

First claim

What is claimed is:

1. A bonded composite comprising:
a first substrate having a first surface;
a second substrate having a second surface; and
a bonding interface between the first surface of the first substrate and the second surface of the second substrate, wherein the bonding interface comprises 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) a linear block copolymer of the formula R-(G) m , wherein m is 1 or 2;
(b) a multi-arm block copolymer of the formula Q n -Y, wherein:
(i) Q represents an arm of the multi-arm block copolymer and each arm independently has the formula G-R,
(ii) n represents the number of arms and is a whole number of at least 3; and
(iii) Y is a residue of a multifunctional coupling agent;

wherein each R is a rubbery block consisting essentially of a polyisoprene; and each G is a glassy block comprising a polymerized monovinyl aromatic monomer;
(c) a first high Tg tackifier having a Tg of at least 60 degrees C., wherein the first high Tg tackifier is primarily compatible with the rubbery blocks;
(d) a second high Tg tackifier having a Tg of at least 60 degrees C., wherein the second high Tg tackifier is primarily compatible with the glassy blocks; and
(e) a plasticizer comprising naphthenic oils,
wherein the first surface is a painted surface or primed surface.

2. The bonded composite according to claim 1 , wherein the first surface has a surface energy of less than 35 dyne per centimeter.

3. The bonded composite according to claim 1 , wherein the linear block copolymer comprises two glassy blocks.

4. The bonded composite according to claim 1 , wherein the first high Tg tackifier has a softening point of at least about 115 degrees C., and the second high Tg tackifier has a softening point of at least about 115 degrees C.

5. The bonded composite according to claim 1 , wherein a ratio of a total weight of all multi-arm block polymers to a total weight of all linear block copolymers ranges from 5.7:1 to 1.5:1.

6. The bonded composite according to claim 1 , wherein a ratio of a total weight of all block copolymers to a total weight of all high Tg tackifiers ranges from 1.2:1 to 1:1.2.

7. The bonded composite according to claim 1 , wherein a ratio of a total weight of high Tg tackifier(s) that are primarily compatible with the rubbery blocks to a total weight of the high Tg tackifier(s) that are primarily compatible with the glassy blocks ranges from 9:1 to 0.67:1.

8. The bonded composite according to claim 1 , wherein a total amount of the plasticizers, expressed as a percent by weight based on a total weight of the linear block copolymer, the multi-arm block copolymer, the first high Tg tackifier, the second high Tg tackifier, and the plasticizers ranges from 2 to 10 wt %.

9. The bonded composite according to claim 1 further comprising a second adhesive skin bonded to the second major surface of the foam backing.

10. The bonded composite according to claim 1 , wherein the multi-arm block copolymer is a star block copolymer.

11. The bonded composite according to claim 10 , wherein the multi-arm block copolymer is a polymodal, asymmetric star block copolymer.

12. The bonded composite according to claim 10 , wherein a ratio of a total weight of all multi-arm block polymers to a total weight of all linear block copolymers ranges from 5.7:1 to 1.5:1.

13. The bonded composite according to claim 10 , wherein a ratio of a total weight of all block copolymers to a total weight of all high Tg tackifiers ranges from 1.2:1 to 1:1.2.

14. The bonded composite according to claim 10 , wherein a ratio of a total weight of high Tg tackifier(s) that are primarily compatible with the rubbery blocks to a total weight of the high Tg tackifier(s) that are primarily compatible with the glassy blocks ranges from 9:1 to 0.67:1.

15. The bonded composite according to claim 10 , wherein a total amount of the plasticizers, expressed as a percent by weight based on a total weight of the linear block copolymer, the multi-arm block copolymer, the first high Tg tackifier, the second high Tg tackifier, and the plasticizers ranges from 2 to 10 wt %.

Assignees

• Hanley Kenneth J
• Jennen Jay M
• Laperre James D
• Gadbois Gregory B
• Waid Robert D
• Zoller Panu K
• 3M Innovative Properties Co

Inventors

• Hanley Kenneth J
• Jennen Jay M
• Laperre James D
• Gadbois Gregory B
• Waid Robert D
• Zoller Panu K

Classifications

• C09J153/025

  modified · CPC title

• C08K5/01

  Hydrocarbons {(C08K5/0091 takes precedence)} · CPC title

• B32B7/12 Primary

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

• C08L2666/24

  Graft or block copolymers according to groups C08L51/00, C08L53/00 or C08L55/02; Derivatives thereof · CPC title

• Y10T428/249985

  Composition of adhesive or bonding component specified · CPC title