EP0349216A1
Expired / Lapsed
EP
⏱️ 0.0 years remaining
Pressure-sensitive adhesive
Assignee: 3M Co
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Filing: 1989-06-23
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Granted: —
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Expires: 2009-06-23
Abstract
Abstract The present invention provides an acrylate pressure-sensitive adhesive tape having improved adhesion to painted surfaces and low temperature performance. The tapes include an adhesive layer containing a phase-separated ultraviolet-radiation polymerized pressure-sensitive adhesive wherein the first phase contains an acrylic copolymer, and the second phase contains a hydrocarbon elastomer or blend of hydrocarbon elastomers, each of the elastomers containing at least one unsaturated segment having a glass transition temperature lower than that of the acrylic copolymer, the elastomer phase being a continuous phase.
Inventors
- 👤 Mark D. C/O Minnesota Mining And Purgett
- 👤 David J. C/O Minnesota Mining And Kinning
- 👤 Robert R.L. C/O Minnesota Mining And Smolders
- 👤 Yvan A. C/O Minnesota Mining And Bogaert
- 👤 Albert I. C/O Minnesota Mining And Everaerts
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-10-31 13:06
CPC Classifications
C; C09; C09J; C09J151/00; C09J151/04; C09J133/00; C09J133/04; C09J133/06; C09J133/08; C09J133/18; C09J133/20; C09J7/00; C09J7/30; C09J7/38; C09J7/381; C09J7/385; C08; C08L; C08L21/00; C08L2666/00; C08L2666/02; C08L2666/04; C09J2301/00; C09J2301/30; C09J2301/302
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
183 words
A pressure-sensitive adhesive tape comprising a phase-separated ultraviolet-radiation polymerized pressure-sensitive adhesive layer comprising: a) from about 65 parts to about 95 parts of an acrylic copolymer of monomers containing: (i) from about 60 to about 90 parts of an alkyl acrylate monomer, the alkyl groups of which have an average of 4 to 12 carbon atoms, (ii)correspondingly, from about 40 parts to about 10 parts of a monoethylenically unsaturated polar copolymerizable monomer, and (iii)from about 0.01 part to about 1 part of a photoinitiator, and b) correspondingly, from about 35 parts to about 5 parts of a hydrocarbon elastomer or blend of hydrocarbon elastomers, each of said elastomers comprising at least one unsaturated segment having a lower T g than said acrylic copolymer, said adhesive layer having at least a first phase and a second phase, said first phase consisting primarily of said elastomer, said second phase consisting primarily of said acrylic copolymer, wherein said pressure-sensitive adhesive tape has improved adhesion to painted surfaces and low temperature shock performance than an otherwise identical adhesive tape wherein the adhesive layer contains no hydrocarbon elastomer.
Claim 2
Dependent Claim
183 words
A pressure-sensitive adhesive tape comprising a phase-separated ultraviolet-radiation polymerized pressure-sensitive adhesive layer comprising: a) from about 65 parts to about 95 parts of an acrylic copolymer of monomers containing: (i) from about 60 to about 90 parts of an alkyl acrylate monomer, the alkyl groups of which have an average of 4 to 12 carbon atoms, (ii)correspondingly, from about 40 parts to about 10 parts of a monoethylenically unsaturated polar copolymerizable monomer, and (iii)from about 0.01 part to about 1 part of a photoinitiator, and b) correspondingly, from about 35 parts to about 5 parts of a hydrocarbon elastomer or blend of hydrocarbon elastomers, each of said elastomers comprising at least one unsaturated segment having a lower T g than said acrylic copolymer, said adhesive layer having at least a first phase and a second phase, said first phase consisting primarily of said elastomer, said second phase consisting primarily of said acrylic copolymer, wherein said pressure-sensitive adhesive tape has improved adhesion to painted surfaces and low temperature shock performance than an otherwise identical adhesive tape wherein the adhesive layer contains no hydrocarbon elastomer.
Claim 3
Dependent Claim
50 words
The pressure-sensitive adhesive tape of claim 1 wherein said unsaturated segment of said elastomer having a lower glass transition temperature than the acrylic copolymer comprises at least 50% by weight of the elastomer wherein said adhesive layer comprises from about 10 parts to about 25 parts of said hydrocarbon elastomer.
Claim 4
Dependent Claim
25 words
The pressure-sensitive adhesive tape of claim 1 wherein said hydrocarbon elastomer is selected from the group consisting of styrene-butadiene multiblock copolymers, and butadiene styrene copolymers.
Claim 5
Dependent Claim
81 words
A pressure-sensitive adhesive tape according to claim 1 wherein said adhesive layer comprises an acrylic copolymer of monomers containing a) from about 60 parts to about 99 parts of an alkyl acrylate ester selected from the group consisting of isooctyl acrylate, isononyl acrylate, decyl acrylate, dodecyl acrylate, butyl acrylate, ethyl-hexyl acrylate and hexyl acrylate, b) correspondingly from about 40 parts to about 1 part of a monoethylenically unsaturated polar copolymerizable monomer selected from the group consisting of acrylic acid, and N-vinylpyrrolidone.
Claim 6
Dependent Claim
41 words
A pressure-sensitive adhesive tape according to claim 4 wherein said adhesive layer comprises an acrylic copolymer of monomers containing a)from about 80 parts to about 90 parts isooctyl acrylate and b)correspondingly, from about 10 parts to about 20 parts acrylic acid.
Claim 7
Dependent Claim
13 words
A pressure-sensitive adhesive tape according to claim 1 further comprising a core layer.
Claim 8
Dependent Claim
19 words
A pressure-sensitive adhesive tape according to claim 6 wherein said core layer comprises a single-phase ultraviolet-radiation polymerized acrylic copolymer.
Claim 9
Dependent Claim
49 words
A pressure-sensitive adhesive tape having a core layer according to claim 7 wherein said single-phase ultraviolet-radiation polymerized acrylic copolymer comprises from about 95 parts to about 99 parts of said alkyl acrylate monomer, and correspondingly, from about 5 parts to about 1 part of said strongly polar copolymerizable monomer.
Claim 10
Dependent Claim
27 words
The pressure-sensitive adhesive tape of claim 6 wherein said core comprises a polymeric material selected from the group consisting of polyethylene, polypropylene, polyacrylates, neoprene, polyolefin, and polyurethane.
Claim 11
Dependent Claim
17 words
The pressure-sensitive adhesive tape of claim 1 wherein said adhesive layer further comprises a chain transfer agent.
References Cited (Backward Citations)
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