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EP0355991A2 Expired / Lapsed EP ⏱️ 0.0 years remaining

Silicone-based pressure-sensitive adhesives having high solids content

Assignee: 3M Co
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Filing: 1989-07-19
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Granted: —
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Expires: 2009-07-19
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Abstract

Abstract This invention relates to organopolysiloxane compositions and, more particularly, to such compositions that can be cured to produce pressure-sensitive adhesives. While the hydrosilation reaction of alkenylsiloxanes with hydrosilanes in the presence of a suitable catalyst has been used to prepare potting, molding, and elastomeric products as well as materials useful for providing substrates with a release surface, the reaction has not been used to a great extent to provide pressure-sensitve adhesives. The present invention provides pressure-sensitive adhesive composition comprising (a) a benzene soluble, resinous copolymer, (b) a diorganoalkenylsiloxy endblocked polydiorganosiloxane, (c) a diorganohydrogensiloxy endblocked polydiorganosiloxane, (d) a crosslinking agent, and (e) a hydrosilation catalyst in an amount sufficient to effect curing of the composition. The major advantage of the present invention is that solvent need not be used to apply the composition. This non-use of solvent results in savings of material, time, and energy, and reduction in health and safety hazards.

Inventors

  • 👤 Larry D. C/O Minnesota Mining And Boardman

Bibliographic Details

Application Number —
Jurisdiction EP
Data Source google_patents
Last Synchronized 2026-11-05 21:48
CPC Classifications
C; C09; C09J; C09J183/00; C09J183/04; C08; C08L; C08L83/00; C08L2666/00; C08L2666/28; C08L2666/44

Claims Analysis

Total Claims: 11
Claim 1
Independent Claim 72 words
Composition capable of being cured to form a pressure-sensitive adhesive comprising a flowable mixture of: (a) a benzene soluble, resinous copolymer having triorganosiloxy and SiO 4/2 units, (b) a diorganoalkenylsiloxy endblocked polydiorganosiloxane, (c) a diorganohydrogensiloxy endblocked polydiorganosiloxane, (d) an organosilicon compound containing more than two groups reactive with a hydrogen or alkenyl group of a polysiloxane, and (e) a hydrosilation catalyst in an amount sufficient to effect the curing of said composition.
Claim 2
Dependent Claim 72 words
Composition capable of being cured to form a pressure-sensitive adhesive comprising a flowable mixture of: (a) a benzene soluble, resinous copolymer having triorganosiloxy and SiO 4/2 units, (b) a diorganoalkenylsiloxy endblocked polydiorganosiloxane, (c) a diorganohydrogensiloxy endblocked polydiorganosiloxane, (d) an organosilicon compound containing more than two groups reactive with a hydrogen or alkenyl group of a polysiloxane, and (e) a hydrosilation catalyst in an amount sufficient to effect the curing of said composition.
Claim 3
Dependent Claim 58 words
The composition of claim 1 comprising 50 to 65 parts of component (a) and 50 to 35 parts of components (b) plus (c) plus(d), the ratio of the total number of alkenyl groups present in (b) plus (d) to the total number of silicon-bonded hydrogen atoms present in (c) plus (d) ranging from about 0.8 to about 1.2.
Claim 4
Dependent Claim 67 words
The composition of claim 1 wherein the ethylenically unsaturated diorganosiloxy endcapped diorganosiloxane has the average formula wherein each R⁴ independently represents a monovalent group selected from alkyl groups and aryl groups, with at least 70 percent of the R⁴ groups being methyl, x is zero or a number having a value up to about 1000, n is zero or a number having a value up to 16.
Claim 5
Dependent Claim 18 words
The composition of claim 3 wherein x is a number having a value of from 15 to 50.
Claim 6
Dependent Claim 26 words
The composition of claim 3 wherein each R⁴ independently represents a monovalent group selected from alkyl groups having 1 to 18 carbon atoms and phenyl group.
Claim 7
Dependent Claim 54 words
The composition of claim 1 wherein the diorganohydrogensiloxy endcapped polydiorganosiloxane has the average formula wherein each R⁵ independently represents a monovalent group selected from alkyl groups and aryl groups, with at least 70 percent of the R⁵ groups being methyl, and y is zero or a number having a value up to about 1000.
Claim 8
Dependent Claim 18 words
The composition of claim 6 wherein y is a number having a value of from 15 to 50.
Claim 9
Dependent Claim 26 words
The composition of claim 6 wherein each R⁵ independently represents a monovalent group selected from alkyl groups having 1 to 18 carbon atoms and phenyl group.
Claim 10
Dependent Claim 17 words
A pressure-sensitive adhesive article comprising a substrate bearing a layer of the cured composition of claim 1.
Claim 11
Dependent Claim 12 words
The pressure-sensitive adhesive article of claim 9 wherein the substrate is flexible.

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