US4075285A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Rubber-modified polystyrene resin composition
Assignee: Sumitomo Chemical Co Ltd
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Filing: 1975-03-03
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Granted: 1978-02-21
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Expires: 1995-03-03
Abstract
Abstract A rubber-modified polystyrene resin composition consisting essentially of a rubber-modified polystyrene and a transparent, resinous styrene-butadiene block copolymer containing 65 to 95% by weight of styrene and 5 to 35% by weight of butadiene. This resin composition is excellent in impact strength, elongation, flexural stress clouding, hinging endurance, and surface gloss.
Inventors
- 👤 Minoru Tabana
- 👤 Shizuo Narisawa
- 👤 Tatsuyuki Mitsuno
- 👤 Hiroshi Maki
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 05:58
CPC Classifications
C; C08; C08L; C08L25/00; C08L25/02; C08L25/04; C08L25/06; C08L51/00; C08L51/04; C08L53/00; C08L53/02
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
86 words
A resin composition consisting essentially of a rubber modified polystyrene which is obtained by mechanically mixing a rubbery substance selected from the group consisting of polybutadiene, and styrene-butadiene with polystyrene or by graft-copolymerizing styrene with said rubbery substance and a transparent styrene-butadiene block copolymer containing 65 to 95% by weight of styrene and 5 to 35% by weight of butadiene, wherein the ratio of said rubber-modified polystyrene to said styrene-butadiene block copolymer is in the range from 0.5 : 99.5 to 15 : 85 by weight.
Claim 2
Dependent Claim
86 words
A resin composition consisting essentially of a rubber modified polystyrene which is obtained by mechanically mixing a rubbery substance selected from the group consisting of polybutadiene, and styrene-butadiene with polystyrene or by graft-copolymerizing styrene with said rubbery substance and a transparent styrene-butadiene block copolymer containing 65 to 95% by weight of styrene and 5 to 35% by weight of butadiene, wherein the ratio of said rubber-modified polystyrene to said styrene-butadiene block copolymer is in the range from 0.5 : 99.5 to 15 : 85 by weight.
Claim 3
Dependent Claim
209 words
A resin composition according to claim 1, wherein the structure of the styrene-butadiene block copolymer is 1. (S-B) n , (S-B) n -S, or B-(S-B) n , 2. [S-(S/B)] n , [S-(S/B)] n -S, or (S-B)-[S-(S/B)] n , 3. [(B→S)] n -S, S-[(B→S)] n , S-[(B→S)] n -S, or S-[(S←B→S)] n -S, or 4. S-[(S/B)→ (S/B)]-S, or S-[(S/B) ← (S/B) → (S/B)]-S wherein S represents a block chain composed of polymerized styrene, B represents an elastomeric block chain composed of polymerized butadiene, (S/B) represents an elastomeric block chain comprising copolymerized styrene and butadiene, in which chain styrene and butadiene are bound to each other in a fixed ratio [the ratio of S to B in (S/B) can be any of the ratios including the case where S is absent], (B→S) or (S←B→S) represents an elastomeric block chain comprising copolymerized styrene and butadiene, in which chain in the direction denoted by an arrow butadiene content gradually decreases while styrene content increases, [(S/B) → (S/B)] or [(S/B) ← (S/B) → (S/B)] represents an elastomeric block chain comprising a styrene-butadiene copolymer chain in which styrene and butadiene are bound in a random ratio and the ratio vaires within the chain intermittently or continuously, and n is an integer of 1 to 3.
Claim 4
Dependent Claim
25 words
A resin composition according to claim 2, wherein the elastomeric block chain in the styrene-butadiene block copolymer is a polymeric chain comprising styrene-butadiene copolymer chain.
Claim 5
Dependent Claim
16 words
A resin composition according to claim 1, which is incorporated with a stabilizer, colorant, and lubricant.
References Cited (Backward Citations)
FR1471458A
Cited
GB1145923A
Cited
FR1493846A
Cited
US3562204A
Cited
FR2037432A5
Cited
US3906057A
Cited
US3853978A
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US3873645A
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US3835200A
Cited
US3907930A
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1981-02-20 | 1981-08-22 | 1982-02-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1985-02-20 | 1985-08-22 | 1986-02-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1989-02-20 | 1989-08-22 | 1990-02-21 | $7700.00 | Window Closed / Lapsed |