US4181635A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Pressure sensitive adhesive compositions
Assignee: Kuraray Co Ltd
•
Filing: 1978-02-17
•
Granted: 1980-01-01
•
Expires: 1998-02-17
Abstract
Abstract A pressure-sensitive adhesive composition having excellent tackiness and improved thermal resistance comprises (A) a low molecular weight polyisoprene, which may be obtained by polymerizing isoprene monomer with the aid of a lithium-type catalyst, said polyisoprene having a cis-1,4 content of not less than 75%, a viscosity average molecular weight of 8,000 to 77,000 and an Mw/Mn value (Mw: weight average molecular weight; Mn: number average molecular weight) of 1.0 to 2.7 and (B) an elastomer.
Inventors
- 👤 Hideo Takamatsu
- 👤 Shobu Minatono
- 👤 Katsuyoshi Terao
- 👤 Junnosuke Yamauchi
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 19:29
CPC Classifications
C; C08; C08F; C08F136/00; C08F136/02; C08F136/04; C08F136/06; C09; C09J; C09J109/00; C09J121/00; C08L; C08L2666/00; C08L2666/02; C08L2666/04; C08L2666/08
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
149 words
In a pressure-sensitive adhesive composition comprising a low molecular weight polyisoprene (A), an elastomer (B) selected from the group consisting of polybutadiene, cis-1,4-polyisoprene, natural rubber, styrene-butadiene random or block copolymer, styrene-isoprene random or block copolymer, acrlyonitrile-butadiene copolymer, acrylonitrile-isoprene copolymer, ethylene-propylene copolymer, ethylene-vinyl acetate copolymer, chloroprene rubber, polyisobutylene and butyl rubber, and a tackifying resin (C), wherein the improvement comprises: using as said low molecular weight polyisoprene (A) a polyisoprene having a cis-1,4 content of at least 75%, a viscosity average molecular weight of between 8,000 and 77,000 and a M w /M n value of from 1.0 to 2.7, wherein Mw is the weight average molecular weight and Mn is the number average molecular weight; and wherein the weight ratio of said polyisoprene (A) to said elastomer (B) is 5-85:95-15, and wherein said tackifying resin (C) comprises up to 250 weight parts for each 100 weight of said elastomer.
Claim 2
Dependent Claim
149 words
In a pressure-sensitive adhesive composition comprising a low molecular weight polyisoprene (A), an elastomer (B) selected from the group consisting of polybutadiene, cis-1,4-polyisoprene, natural rubber, styrene-butadiene random or block copolymer, styrene-isoprene random or block copolymer, acrlyonitrile-butadiene copolymer, acrylonitrile-isoprene copolymer, ethylene-propylene copolymer, ethylene-vinyl acetate copolymer, chloroprene rubber, polyisobutylene and butyl rubber, and a tackifying resin (C), wherein the improvement comprises: using as said low molecular weight polyisoprene (A) a polyisoprene having a cis-1,4 content of at least 75%, a viscosity average molecular weight of between 8,000 and 77,000 and a M w /M n value of from 1.0 to 2.7, wherein Mw is the weight average molecular weight and Mn is the number average molecular weight; and wherein the weight ratio of said polyisoprene (A) to said elastomer (B) is 5-85:95-15, and wherein said tackifying resin (C) comprises up to 250 weight parts for each 100 weight of said elastomer.
Claim 3
Dependent Claim
17 words
The pressure-sensitive adhesive composition of claim 1, wherein said elastomer is a polymer containing repeating isoprene units.
Claim 4
Dependent Claim
12 words
The adhesive composition of claim 1 wherein said elastomer is natural rubber.
Claim 5
Dependent Claim
14 words
The pressure-sensitive adhesive composition of claim 1 wherein said elastomer is a synthetic cis-1,4-polyisoprene.
Claim 6
Dependent Claim
44 words
The pressure-sensitive adhesive composition of claim 1 which said tackifying resin is at least one member selected from the group consisting of rosin-type resin, terpene-type resin, aromatic hydrocarbon resin, aliphatic hydrocarbon resin, alicyclic hydrocarbon resin, phenolic resin, coumarone-indene resin and hydrogenated petroleum oil resin.
Claim 7
Dependent Claim
23 words
The pressure-sensitive adhesive composition of claim 1, wherein said low molecular weight polyisoprene is obtained by polymerizing isoprene monomer using a lithium catalyst.
Claim 8
Dependent Claim
54 words
The pressure-sensitive adhesive composition of claim 1 wherein said low molecular weight polyisoprene is obtained by polymerizing isoprene monomer in a hydrocarbon solvent selected from the group consisting of n-butane, isopentane, n-hexane, n-heptane, benzene, toluene and xylene, using a lithium catalyst selected from the group consisting of methyllithium, propyllithium, butyllithium, α-naphthyllithium, methylenedilithium and distyrenyllithium.
Claim 9
Dependent Claim
28 words
The pressure-sensitive adhesive composition of claim 7, wherein said lithium-type catalyst is used in the proportion of 0.88-23 miliequivalents catalyst as lithium per mol equivalent of isoprene monomer.
Claim 10
Dependent Claim
22 words
The pressure-sensitive adhesive composition of claim 8, wherein said proportion is 10.5-12.2 milliequivalents catalyst as lithium per mol equivalent of isoprene monomer.
Claim 11
Dependent Claim
25 words
The pressure-sensitive adhesive composition of claim 1, wherein the viscosity average molecular weight of said low molecular weight polyisoprene (A) is between 15,000 and 65,000.
Claim 12
Dependent Claim
24 words
The pressure-sensitive adhesive composition of claim 1, wherein said vaue of M w /M n is in the range of from 1.0 to 2.1.
References Cited (Backward Citations)
CA700959A
Cited
GB990439A
Cited
GB1031015A
Cited
US3326824A
Cited
GB1111978A
Cited
US3516977A
Cited
DE1953101A1
Cited
US4048124A
Cited
US4060503A
Cited
US4096103A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1982-12-31 | 1983-07-02 | 1984-01-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1986-12-31 | 1987-07-02 | 1988-01-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1990-12-31 | 1991-07-02 | 1992-01-01 | $7700.00 | Window Closed / Lapsed |