Self-wetting adhesive composition

Patent metadata

Field	Value
Publication number	US-2016096982-A1
Application number	US-201414787021-A
Country	US
Kind code	A1
Filing date	Jun 10, 2014
Priority date	Jun 24, 2013
Publication date	Apr 7, 2016
Grant date	—

Abstract

A self-wetting adhesive composition is described comprising the reaction product of a low T g (meth)acrylate solute copolymer component; a low T g solvent monomer solvent monomer component comprising low T g monomers, a multifunctional acrylate; and a polymerizable siloxane copolymer having at least one polydiorganosiloxane segment and at least on oxyalkylene segment.

First claim

What is claimed is:

1 . A syrup polymer composition comprising:
a) 5 to 40 parts by weight of a low T g (meth)acrylate solute copolymer component; b) 60 to 95 parts by weight of a low Tg solvent monomer solvent monomer component comprising low Tg monomers and a multifunctional acrylate; the sum of a) and b) being 100 parts by weight; c) 5 to 50 parts by weight, relative to a) and b) of a siloxane copolymer having at least one polydiorganosiloxane segment and at least on oxyalkylene segment relative to 100 parts a) and b).

2 . The syrup polymer composition of claim 1 wherein the composition comprises 5 to 20 parts of siloxane copolymer, relative to 100 parts of a) and b).

3 . The syrup polymer composition of any of the previous claims wherein the solute copolymer comprises:
a) 95-100 parts by weight of low T g monomer units; b) 0 to 5 parts of acid-functional monomer units; c) 0 to 5 parts of a non-acid functional polar monomer the sum being 100 parts by weight.

4 . The syrup polymer composition of any of the previous claims wherein the solvent monomer component comprises:
a) 60 to 90 parts by weight of low T g monomers; b) 0 to 5 parts of acid functional monomers; c) 10 to 40 parts of a multiacrylate;
the sum being 100 parts by weight.

5 . The syrup polymer composition of any of the previous claims comprising 20 to 50 parts of a siloxane copolymer, relative to 100 parts a) and b).

6 . The syrup polymer composition of any of the previous claims wherein the solute low T g copolymer comprises 1 to 5 parts by weight of acid-functional monomer units and 5 to 95 parts by weight of low T g monomer units.

7 . The syrup polymer composition of any of the previous claims wherein the solute low Tg copolymer comprises 1 to 5 parts by weight of non-acid-functional monomer units.

8 . The syrup polymer composition of any of the previous claims wherein the solvent monomer component comprises 1 to 5 parts by weight of acid-functional monomer units.

9 . The syrup polymer composition of any of the previous claims wherein the solute low T g copolymer comprises 100 parts by weight of low T g monomer units.

10 . The syrup polymer composition of any of the previous claims wherein the solute low T g copolymer has a T g of less than 0° C., preferably less than −20° C., more preferably less than −50° C.

11 . The syrup polymer composition of any of the previous claims wherein the segmented siloxane copolymer comprises at least two (meth)acrylate groups.

12 . The syrup polymer composition of any of claims 1 - 11 wherein the segmented siloxane copolymer is of the formula:
X—(R 2 —O) a —Q—(SiR 1 2 O) b —Q—(O—R 2 ) a —X

where X is H or a free radically polymerizable group;
R 2 is an alkylene group;
Q is difunctional linking group;
R 1 is alkyl or aryl group; and
a and b are independently integers greater than 1, with the proviso that at least one X is a free radically polymerizable group.

13 . The syrup polymer composition of any of claims 1 - 11 wherein the segmented siloxane copolymer is of the formula:
R 1 3 SiO—(SiR 1 2 O) b —(SiR 1 (—Q(—O—R 2 ) a —X)O) a SiR 1 3

where R 1 is alkyl or aryl group;
X is a free radically polymerizable group;
R 2 is an alkylene group;
Q is a difunctional linking group; and
a and b are independently integers greater than 1.

14 . An adhesive comprising the cured syrup polymer composition of any of the previous claims.

15 . A method of making an adhesive comprising the steps of:
partially polymerinzing a low T g monomer and optional acid functional monomer to a viscosity produce a syrup polymer composition, adding a multifunctional acrylate crosslinker agent, optional additional monomers, and a siloxane copolymer having at least one polydiorganosiloxane segment and at least on oxyalkylene segment, and further photopolymerizing.

16 . The method of claim 15 wherein the syrup polymer composition has a viscosity of from 500 to 10,000 cPs at 22° C.

17 . The method of any of claims 15 - 16 , wherein the syrup copolymer comprises up to 30 parts by weight of the solute copolymer in solvent monomers.

18 . The method of any of claims 15 - 17 comprising the steps of partially polymerizing a low T g monomer and other optional monomers to produce a syrup polymer composition of claim 1 , adding a multifunctional acrylate crosslinker agent, additional monomers, and plasticizer, and further photopolymerizing.

19 . The method of any of claims 15 - 18 where the other optional additional monomers comprise non-acid functional polar monomers.

20 . The method of claim 18 wherein up to 20 parts of additional monomers are added relative to 100 parts total monomers.

21 . An adhesive article comprising a substrate and a coating of the cured adhesive of nay of claims 1 - 13 on a surface thereof.

22 . The adhesive article of claim 21 wherein the adhesive has a 180° peel value of ≦5 Newtons/decimeter.

23 . The adhesive article of claim 21 wherein the substrate is transparent.

24 . The adhesive article of claim 21 wherein the adhesive has a transmissivity of greater than 90% in the visible range.

25 . The adhesive article of claim 21 wherein the substrate is a solar control film.

26 . The adhesive article of claim 21 having a transmissivity of at least 80% in the visible range.

27 . An adhesive comprising
a) 10 to 40 parts by weight of a low T g (meth)acrylate solute copolymer component; b) 60 to 90 parts by weight of a crosslinked low T g solvent copolymer component; and c) 5 to 50 parts by weight a siloxane copolymer having at least one polydiorganosiloxane segment and at least on oxyalkylene segment, relative to a) and b).

Assignees

• 3M Innovative Properties Co

Inventors

• Fornof Ann R
• Dizio James P

Classifications

• C09J4/06

  {Organic non-macromolecular compounds having at least one polymerisable carbon-to-carbon unsaturated bond} in combination with a macromolecular compound other than an unsaturated polymer of groups C09J159/00 - C09J187/00 · CPC title

• C08K5/0025

  Crosslinking or vulcanising agents; including accelerators · CPC title

• C09D4/06

  {Organic non-macromolecular compounds having at least one polymerisable carbon-to-carbon unsaturated bond} in combination with a macromolecular compound other than an unsaturated polymer of groups C09D159/00 - C09D187/00 · CPC title

• C09J133/08

  Homopolymers or copolymers of acrylic acid esters · CPC title

• C08L83/04

  Polysiloxanes · CPC title