US4267084A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Vinyl chloride polymer blend composition
Assignee: Tokuyama Corp
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Filing: 1979-10-02
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Granted: 1981-05-12
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Expires: 1999-10-02
Abstract
Abstract The present invention provides a vinyl chloride polymer composition comprising an intimate mixture of a first vinyl chloride polymer containing a sulfide linkage in the molecular chain and a second vinyl chloride polymer having a higher molecular weight than the first polymer, and a process for producing a first vinyl chloride polymer for use in the composition, comprising polymerizing vinyl chloride or a mixture of vinyl chloride and an ethylenically unsaturated monomer in the presence of a free radical initiator using as a chain transfer agent a mercapto compound or a disulfide compound. Said vinyl chloride polymer composition has been improved in heat stability and processability.
Inventors
- 👤 Yukio Mizutani
- 👤 Katsuo Mitani
- 👤 Takashi Maehara
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 06:06
CPC Classifications
C; C08; C08L; C08L27/00; C08L27/02; C08L27/04; C08L27/06; C08L2205/00; C08L2205/02
Claims Analysis
Total Claims: 20
Claim 1
Independent Claim
66 words
A vinyl chloride polymer composition comprising an intimate mixture of a first vinyl chloride polymer containing a sulfide linkage and a hydroxyl group in the molecular chain, which is obtained by radical polymerization in the presence of, as a chain transfer agent, a mercaptoalkanol compound containing 2 or 3 carbon atoms, and a second vinyl chloride polymer having a higher molecular weight than the first polymer.
Claim 2
Dependent Claim
66 words
A vinyl chloride polymer composition comprising an intimate mixture of a first vinyl chloride polymer containing a sulfide linkage and a hydroxyl group in the molecular chain, which is obtained by radical polymerization in the presence of, as a chain transfer agent, a mercaptoalkanol compound containing 2 or 3 carbon atoms, and a second vinyl chloride polymer having a higher molecular weight than the first polymer.
Claim 3
Dependent Claim
35 words
The composition of claim 1 wherein said first vinyl chloride polymer is a homopolymer of vinyl chloride having a low molecular weight and containing a sulfide linkage and a hydroxyl group in the molecular chain.
Claim 4
Dependent Claim
38 words
The composition of claim 1 wherein said first vinyl chloride polymer is a copolymer of vinyl chloride with an ethylenically unsaturated monomer copolymerizable with it, which contains a sulfide linkage and a hydroxyl group in the molecular chain.
Claim 5
Dependent Claim
26 words
The composition of claim 3 wherein said first vinyl chloride copolymer contains at least 70% by weight of a unit derived from the vinyl chloride monomer.
Claim 6
Dependent Claim
19 words
The composition of claim 4 wherein the proportion of the vinyl chloride unit is at least 80% by weight.
Claim 7
Dependent Claim
25 words
The composition of claim 1 wherein said first vinyl chloride polymer contains 0.01 to 2% by weight of sulfur atoms which form said sulfide linkage.
Claim 8
Dependent Claim
17 words
The composition of claim 6 wherein the content of sulfur atoms is 0.05 to 1% by weight.
Claim 9
Dependent Claim
17 words
The composition of claim 1 wherein said second vinyl chloride polymer is a homopolymer of vinyl chloride.
Claim 10
Dependent Claim
25 words
The composition of claim 1 wherein said second vinyl chloride polymer is a copolymer of vinyl chloride and an ethylenically unsaturated monomer copolymerizable with it.
Claim 11
Dependent Claim
23 words
The composition of claim 9 wherein said copolymer contains at least 70% by weight of a unit derived from the vinyl chloride monomer.
Claim 12
Dependent Claim
20 words
The composition of claim 10 wherein the proportion of the vinyl chloride monomer unit is at least 80% by weight.
Claim 13
Dependent Claim
24 words
The composition of claim 1 wherein said first vinyl chloride polymer has a weight average degree of polymerization of about 100 to about 800.
Claim 14
Dependent Claim
24 words
The composition of claim 1 wherein said second vinyl chloride polymer has a weight average degree of polymerization of about 600 to about 2000.
Claim 15
Dependent Claim
24 words
The composition of claim 1 wherein said first vinyl chloride polymer has a weight average degree of polymerization of about 100 to about 600.
Claim 16
Dependent Claim
56 words
The composition of claim 1 which comprises an intimate mixture of a first vinyl chloride polymer having a weight average degree of polymerization of about 300 to about 600 and containing a sulfide linkage in the molecular chain and a second vinyl chloride polymer having a weight average degree of polymerization of at least about 1,000.
Claim 17
Dependent Claim
61 words
The composition of claim 1 which comprises an intimate mixture of a first vinyl chloride polymer having a weight average degree of polymerization of about 100 to about 500 and containing a sulfide linkage and a hydroxyl group in the molecular chain and a second vinyl chloride polymer having a weight average degree of polymerization of about 600 to about 1,000.
Claim 18
Dependent Claim
34 words
The composition of claim 1 which comprises an intimate mixture of 1 part by weight of the first vinyl chloride polymer and 1 to 19 parts by weight of the second polyvinyl chloride polymer.
Claim 19
Dependent Claim
119 words
A vinyl chloride polymer composition for molding, comprising an intimate mixture of 100 parts by weight in total of a first vinyl chloride polymer containing a sulfide linkage and a hydroxyl group in the molecular chain and a second vinyl chloride polymer having a higher molecular weight, than the first vinyl chloride polymer 0.1 to 10 parts by weight of a heat stabilizer, 0 to 1 parts by weight of an antioxidant, 0 to 0.5 parts by weight of an ultraviolet absorber, 0 to 5 parts by weight of a lubricant, 0 to 150 parts by weight of a plasticizer, 0 to 5 parts by weight of a pigment and 0 to 100 parts by weight of a filler.
Claim 20
Dependent Claim
119 words
A vinyl chloride polymer composition for molding, comprising an intimate mixture of 100 parts by weight in total of a first vinyl chloride polymer containing a sulfide linkage and a hydroxyl group in the molecular chain and a second vinyl chloride polymer having a higher molecular weight, than the first vinyl chloride polymer 0.1 to 10 parts by weight of a heat stabilizer, 0 to 1 parts by weight of an antioxidant, 0 to 0.5 parts by weight of an ultraviolet absorber, 0 to 5 parts by weight of a lubricant, 0 to 150 parts by weight of a plasticizer, 0 to 5 parts by weight of a pigment and 0 to 100 parts by weight of a filler.
References Cited (Backward Citations)
US3711576A
Cited
US3956251A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1984-05-11 | 1984-11-10 | 1985-05-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1988-05-11 | 1988-11-10 | 1989-05-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1992-05-11 | 1992-11-10 | 1993-05-12 | $7700.00 | Window Closed / Lapsed |