US4087484A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for producing transparent block copolymer resin
Assignee: Sumitomo Chemical Co Ltd
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Filing: 1976-01-16
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Granted: 1978-05-02
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Expires: 1996-01-16
Abstract
Abstract An aromatic vinyl compound and a conjugated diene are block-copolymerized in a hydrocarbon solvent using an organolithium compound as an initiator to form a hydrocarbon solution of a block copolymer resin which is then steam-stripped off the solvent in the presence of a specified block polyether type dispersing agent to yield a granular polymer. The block copolymer thus obtained has favorable properties as granules and can be fabricated into articles being highly transparent and having excellent mechanical properties.
Inventors
- 👤 Tamotsu Miki
- 👤 Akio Imai
- 👤 Yuji Kobayashi
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 21:39
CPC Classifications
C; C08; C08L; C08L53/00; C08L53/02
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
195 words
In a process for recovering a granular block copolymer from its hydrocarbon solution obtained by block copolymerizing in a hydrocarbon solvent 90 to 65 parts by weight of a styrene-type monomer and 10 to 35 parts by weight of a conjugated diene using an organolithium compound as an initiator, the improvement whereby a transparent block copolymer resin is produced, which comprises dispersing said block copolymer solution in heated water in the presence of a block-type polyether compound represented by the formula HO(C.sub.2 H.sub.4 O).sub.a (C.sub.3 H.sub.6 O).sub.b (C.sub.2 H.sub.4 O).sub.c H where a, b, and c each represent a number from 10 to 1,000 or the formula ##STR4## where a, b, c, d, e, f, g, and h each represent a number from 5 to 1,000, R represents a hydrocarbon radical having 1 to 10 carbon atoms, the content of the (C 2 H 4 O) portion of said block-type polyether compounds being 30 to 95% by weight and the molecular weight of the polypropylene glycol portion being 1,000 to 5,000 to strip off the solvent from said solution by means of steam stripping and then recovering the block copolymer granules from water by filtration.
Claim 2
Dependent Claim
195 words
In a process for recovering a granular block copolymer from its hydrocarbon solution obtained by block copolymerizing in a hydrocarbon solvent 90 to 65 parts by weight of a styrene-type monomer and 10 to 35 parts by weight of a conjugated diene using an organolithium compound as an initiator, the improvement whereby a transparent block copolymer resin is produced, which comprises dispersing said block copolymer solution in heated water in the presence of a block-type polyether compound represented by the formula HO(C.sub.2 H.sub.4 O).sub.a (C.sub.3 H.sub.6 O).sub.b (C.sub.2 H.sub.4 O).sub.c H where a, b, and c each represent a number from 10 to 1,000 or the formula ##STR4## where a, b, c, d, e, f, g, and h each represent a number from 5 to 1,000, R represents a hydrocarbon radical having 1 to 10 carbon atoms, the content of the (C 2 H 4 O) portion of said block-type polyether compounds being 30 to 95% by weight and the molecular weight of the polypropylene glycol portion being 1,000 to 5,000 to strip off the solvent from said solution by means of steam stripping and then recovering the block copolymer granules from water by filtration.
Claim 3
Dependent Claim
26 words
A process according to claim 1, wherein the block-type polyether compound is used in an amount of 0.05 to 5% by weight based on the polymer.
Claim 4
Dependent Claim
26 words
A process according to claim 1, wherein the styrene-type monomer is at least one member selected from the group consisting of styrene, α-methylstyrene, vinylnaphthalene, and vinyltoluene.
Claim 5
Dependent Claim
26 words
A process according to claim 1, wherein the conjugated diene is at least one member selected from the group consisting of butadiene, isoprene, 2,3-dimethylbutadiene, and piperylene.
Claim 6
Dependent Claim
30 words
A process according to claim 1, wherein the hydrocarbon solvent is at least one member selected from the group consisting of benzene, toluene, xylene, cyclopentane, cyclohexane, methylcyclohexane, hexane, and heptane.
Claim 7
Dependent Claim
23 words
A process according to claim 1, wherein the stripping of solvent is carried out batchwise or continuously by use of a stirred tank.
Claim 8
Dependent Claim
24 words
A process according to claim 7, wherein the block copolymer solution and the heated water are premixed and then fed to the stirred tank.
Claim 9
Dependent Claim
35 words
A process according to claim 7, wherein the heated water, block-type polyether compound, and block copolymer solution are mixed in the stirred tank and live steam is introduced into said tank to elevate the temperature.
Claim 10
Dependent Claim
24 words
A process according to claim 7, wherein the stripping temperature is equal to or higher than the azeotropic point of the solvent and water.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1981-05-01 | 1981-10-31 | 1982-05-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1985-05-01 | 1985-10-31 | 1986-05-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1989-05-01 | 1989-10-31 | 1990-05-02 | $7700.00 | Window Closed / Lapsed |