Oil resistant adhesive

Patent metadata

Field	Value
Publication number	US-10947423-B2
Application number	US-201716080320-A
Country	US
Kind code	B2
Filing date	Feb 3, 2017
Priority date	Mar 10, 2016
Publication date	Mar 16, 2021
Grant date	Mar 16, 2021

Abstract

The present disclosure provides an oil-resistant adhesive comprising a crosslinked copolymer of (meth)acrylic ester monomers, methyl (meth)acrylate monomers, vinyl ester monomers, and a functional monomer selected from one of (meth)acrylic acid, a (meth)acrylamide or a hydroxyalkyl (meth)acrylate monomers.

First claim

What is claimed is:

1. A crosslinked adhesive copolymer composition, the copolymer comprising:
a) 30 to 60 parts of a (meth)acrylic ester monomer, wherein the (meth)acrylic ester monomer is a monomeric (meth)acrylic ester of a non-tertiary alcohol, which alcohol contains from 2 to 14 carbon atoms,
b) 40 to 60 parts of methyl acrylate monomer,
c) 2 to 15 parts of vinyl ester monomers, and
d) 0.1 to 5 parts of an acid functional monomer,
where the sum of a) to d) is 100 parts by weight.

2. The crosslinked adhesive composition of claim 1 comprising 5-10 parts by weight of vinyl ester monomers.

3. The crosslinked adhesive composition of claim 1 comprising 0.5-2 parts by weight of the acid functional monomers.

4. The crosslinked adhesive composition of claim 1 wherein the (meth)acrylic ester is a (meth)acrylic ester, wherein the (meth)acrylic ester monomer contains from 4 to 12 carbon atoms.

5. The composition of claim 1 comprising 0.1 to 5 parts of acid functional monomers, said copolymer crosslinked by a bisamide crosslinking agent.

6. The composition of claim 1 comprising 0.1 to 5 parts of acid functional monomers, said copolymer crosslinked by a polyepoxide crosslinking agent.

7. The composition of claim 1 comprising 0.1 to 5 parts of acid functional monomers, said copolymer crosslinked by a multifunctional oxazoline crosslinking agent.

8. The composition of claim 1 wherein the copolymer has an intrinsic viscosity of >0.95 to 1.4 deciliters/g.

9. The composition of claim 1 wherein the acid functional monomer is (meth)acrylic acid.

10. The adhesive copolymer of claim 1 of the formula prior to crosslinking:
˜[M ester ] a -[M MA ] b -[M VAc ] c -[M D ] d ˜,

where
[M ester ] represents (meth)acrylate ester monomer units and subscript is the parts by weight
[M MA ] represent methyl (meth)acrylate monomer units and subscript b is the parts by weight;
[M VAc ] represent vinyl ester monomer units and subscript c is the parts by weight; and
[M D ] represents one of one of i) acid functional monomers, ii) a (meth)acrylamide monomers or iii) a hydroxyalkyl (meth)acrylate monomers and subscript d represents the parts by weight, the sum of subscripts a to d being 100 parts by weight.

11. The adhesive copolymer of claim 1 wherein the copolymer is prepared by solution polymerization, followed by crosslinking.

12. The adhesive copolymer of claim 1 wherein the copolymer is prepared by solventless polymerization, followed by crosslinking.

13. The adhesive copolymer of claim 1 wherein the copolymer is prepared by syrup polymerization, followed by crosslinking.

14. An adhesive article comprising a layer of the adhesive copolymer of claim 1 on a backing.

15. The adhesive article of claim 14 wherein the backing is paper, polyester or a glass mat.

16. The adhesive article of claim 15 further comprising a glass scrim embedded in the adhesive copolymer layer.

17. An adhesive article of claim 14 , wherein the adhesive article is a tape, and wherein, after the tape has been immersed in an oil for 164 hours and 100° C. according to ASTM D3455, the oil has a maximum change in dielectric loss of 1.0%, a minimum oil-water interfacial tension of 35 mN/M, a maximum acid number of 0.03 mg KOH/g, and a minimum dielectric strength of 28 kV.

Assignees

• 3M Innovative Properties Co

Inventors

• Rosner Robert B
• Wurst Joshua R
• Shimanek Iii Robert J
• Browning Rhesa M
• Fornof Ann R
• Zhu Dong-Wei
• Wohl Adam R

Classifications

• C08F220/14 Primary

  Methyl esters {, e.g. methyl (meth)acrylate} · CPC title

• C08F220/1808

  C8-(meth)acrylate, e.g. isooctyl (meth)acrylate or 2-ethylhexyl (meth)acrylate · CPC title

• C09J7/385 Primary

  Acrylic polymers · CPC title

• C09J133/26

  Homopolymers or copolymers of acrylamide or methacrylamide · CPC title

• C09J7/21

  Paper; Textile fabrics · CPC title