US5066728A
Expired / Lapsed
US
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Radiation-reactive phenylbutadiene multiblock copolymers
Assignee: ExxonMobil Chemical Patents Inc
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Filing: 1990-09-27
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Granted: 1991-11-19
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Expires: 2010-09-27
Abstract
Abstract A multiblock copolymer comprising endblocks of phenylbutadiene and an elastomeric midblock of a conjugated diene such as isoprene or butadiene is disclosed. The copolymer is crosslinkable by EB radiation such that the crosslinks are confined primarily to the endblock domains in the polymer with minimal crosslinking occurring in the rubbery matrix. Also disclosed are blends of the copolymers with tackifier resins compatible with the midblock regions. The blends provide a curable PSA having enhanced cohesive strength while maintaining adhesive properties.
Inventors
- 👤 Jay D. Audett
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 02:33
CPC Classifications
C; C08; C08F; C08F297/00; C08F297/02; C09; C09J; C09J153/00; C08L; C08L2666/00; C08L2666/02
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
47 words
A radiation-reactive multiblock copolymer, comprising: endblocks comprising polymerized monomer of the formula: ##STR3## wherein at least one of R 1 and R 2 is phenyl or hydrocarbyl-substituted phenyl, and one of R 1 and R 2 can be hydrogen; and an elastomeric midblock of a conjugated diene.
Claim 2
Dependent Claim
47 words
A radiation-reactive multiblock copolymer, comprising: endblocks comprising polymerized monomer of the formula: ##STR3## wherein at least one of R 1 and R 2 is phenyl or hydrocarbyl-substituted phenyl, and one of R 1 and R 2 can be hydrogen; and an elastomeric midblock of a conjugated diene.
Claim 3
Dependent Claim
22 words
The multiblock copolymer of claim 1, wherein said endblocks have a weight average molecular weight of from about 10,000 to about 20,000.
Claim 4
Dependent Claim
22 words
The multiblock copolymer of claim 1, wherein said midblocks have a weight average molecular weight of from about 100,000 to about 150,000.
Claim 5
Dependent Claim
20 words
The multiblock copolymer of claim 1, wherein said midblocks comprises polymerized conjugated diene having up to about 12 carbon atoms.
Claim 6
Dependent Claim
18 words
The multiblock copolymer of claim 1, wherein said diene has from about 4 to about 8 carbon atoms.
Claim 7
Dependent Claim
20 words
The multiblock copolymer of claim 1, wherein said conjugated diene is selected from the group consisting of butadiene and isoprene.
Claim 8
Dependent Claim
11 words
The multiblock copolymer of claim 1, wherein said endblocks comprise poly(2-phenylbutadiene).
Claim 9
Dependent Claim
25 words
A cured multiblock copolymer, comprising: the product obtained by exposing the multiblock copolymer of claim 1 to radiation effective to form crosslinks in said endblocks.
Claim 10
Dependent Claim
16 words
The cured multiblock copolymer of claim 8, wherein said midblock is essentially free of said crosslinking.
Claim 11
Dependent Claim
24 words
The cured multiblock copolymer of claim 8, wherein said radiation comprises from about 0.2 to about 20 megarads of electron beam or gamma radiation.
Claim 12
Dependent Claim
27 words
An adhesive composition comprising a blend of: (a) the multiblock copolymer of claim 1; and (b) a tackifying resin compatible with the midblock of said multiblock copolymer.
References Cited (Backward Citations)
US4960831A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1994-11-18 | 1995-05-20 | 1995-11-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1998-11-18 | 1999-05-20 | 1999-11-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2002-11-18 | 2003-05-20 | 2003-11-19 | $7700.00 | Window Closed / Lapsed |