Laminates and articles comprising a block copolymer coating comprising polyorganosiloxane and polyolefin

Patent metadata

Field	Value
Publication number	US-9783699-B2
Application number	US-201314426168-A
Country	US
Kind code	B2
Filing date	Nov 15, 2013
Priority date	Nov 20, 2012
Publication date	Oct 10, 2017
Grant date	Oct 10, 2017

Abstract

Intermediate laminates and articles comprising a low adhesion backsize coating are described. The laminate comprises a substrate having a major surface and opposing surface and a coating comprising a block copolymer disposed on a major surface of the substrate wherein the block copolymer comprises a polyorganosiloxane block and a polyolefin block, the polyolefin block having a melt point of at least 110° C. Also described are medical dressings comprising such laminate.

First claim

What is claimed is:

1. A laminate comprising
a substrate having a major surface and opposing surface; and
a coating comprising a block copolymer disposed on major surface of the substrate wherein the block copolymer comprises a polyorganosiloxane block and a polyolefin block, the polyolefin block having a melt point of at least 110° C. wherein the block copolymer has the structure
A[-L-B] n

wherein n is at least 1,
A is the polyorganosiloxane block,
B is the polyolefin block comprising a polypropylene homopolymer or copolymer, and
L is a divalent linking group comprising the reaction product of an amine or hydroxyl and an anhydride; and
wherein the block copolymer comprises at least 40 wt-% of polyorganosiloxane.

2. The laminate of claim 1 wherein the coating forms an exposed surface layer.

3. The laminate of claim 2 wherein the coating provides a lower coefficient of friction than the substrate.

4. The laminate of claim 2 wherein the coating has a coefficient of friction of less than 0.30.

5. The laminate of claim 1 wherein an adhesive is disposed on the opposing surface of the substrate as the coating.

6. The laminate of claim 5 wherein the adhesive is a pressure sensitive adhesive.

7. The laminate of claim 6 wherein the laminate is wound into a roll such that the pressure sensitive adhesive contacts the coating forming a tape article.

8. The laminate of claim 6 wherein the laminate further comprises a release liner in contact with the pressure sensitive adhesive.

9. The laminate of claim 1 wherein the laminate has an upright moisture vapor transmission rate of at least 1,000 g/m 2 /24 hours.

10. The laminate of claim 1 wherein the laminate further comprises a carrier in contact with the coating.

11. The laminate of claim 1 wherein the carrier is heat sealed through the coating to the substrate.

12. The laminate of claim 1 wherein the polyolefin block comprises a polypropylene homopolymer or copolymer.

13. The laminate of claim 12 wherein the polypropylene copolymer comprises repeat units derived from saturated alkylenes and unsaturated alkenes having 4 to 12 carbon atoms.

14. The laminate of claim 1 wherein n is 2.

15. The laminate of claim 1 wherein the block copolymer is prepared by a reaction of an amine or alcohol functional polyorganosiloxane and an anhydride terminated polyolefin polymer having a melt point of at least 110° C.

16. A medical dressing comprising the laminate of claim 1 .

17. The medical dressing of claim 16 wherein a skin contact material is disposed on the opposing surface of the substrate as the coating.

18. The medical dressing of claim 17 wherein the absorbent is a hydrocolloid, polymer gel, or foam.

19. The medical dressing of claim 16 wherein the skin contact material is an adhesive, an absorbent, or a combination thereof.

20. The laminate of claim 1 wherein the polyorganosiloxane is polydimethylsiloxane.

Assignees

• 3M Innovative Properties Co
• 3M Innovative Properties Co

Inventors

• Sanghi Shilpi K
• Yang Yu
• Iyer Suresh S
• Lu Yongshang

Classifications

• A61F13/0226

  characterised by the support layer · CPC title

• C09J2475/006

  in the substrate · CPC title

• C09J7/0228

  Chemistry & Metallurgy · mapped topic

• A61F13/0203 Primary

  with fluid retention members · CPC title

• C09D153/00 Primary

  Coating compositions based on block copolymers containing at least one sequence of a polymer obtained by reactions only involving carbon-to-carbon unsaturated bonds; Coating compositions based on derivatives of such polymers · CPC title