Patent US580872A successfully refreshed from Google Patents.
Patent US4098845A successfully refreshed from Google Patents.
US4098845A
Expired / Lapsed
US
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Method for accelerating the crystallization rate of crystallizable polyester resin
Assignee: Shell USA Inc
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Filing: 1976-03-11
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Granted: 1978-07-04
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Expires: 1996-03-11
Abstract
Abstract This invention relates to crystallizable polyester compositions having improved molding characteristics. Crystallization rates and properties are improved by the addition of a polymer derived from meta or para diisopropenyl benzene and such polymers terminated by α-methyl styrene.
Inventors
- 👤 Max H. Keck
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 07:54
CPC Classifications
C; C08; C08L; C08L67/00; C08L67/02
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
99 words
A composition comprising a crystallizable polyethylene terephthalate homopolymer and copolymers thereof containing up to about 15 weight percent of repeat units of a copolymerizable monomer selected from the group consisting of saturated aliphatic dicarboxylic acids having from 4 to 10 carbon atoms and from 0.5 to 5 percent by weight of the polyester resin of a polymer selected from the group consisting of a polymer derived from meta diisopropylbenzene diol, para diisopropylbenzene diol, para diisopropylbenzene diol, meta diisopropenylbenzene, para diisopropenylbenzene, para tertiary butyl styrene and polymers of meta diisopropenylbenzene and a polymer of para diisopropenylbenzene terminated by α-methyl styrene.
Claim 2
Dependent Claim
99 words
A composition comprising a crystallizable polyethylene terephthalate homopolymer and copolymers thereof containing up to about 15 weight percent of repeat units of a copolymerizable monomer selected from the group consisting of saturated aliphatic dicarboxylic acids having from 4 to 10 carbon atoms and from 0.5 to 5 percent by weight of the polyester resin of a polymer selected from the group consisting of a polymer derived from meta diisopropylbenzene diol, para diisopropylbenzene diol, para diisopropylbenzene diol, meta diisopropenylbenzene, para diisopropenylbenzene, para tertiary butyl styrene and polymers of meta diisopropenylbenzene and a polymer of para diisopropenylbenzene terminated by α-methyl styrene.
Claim 3
Dependent Claim
72 words
A composition comprising polyethylene terephthalate polyester and copolyesters thereof containing up to 15 mol percent of an acid selected from the group consisting of a saturated aliphatic dicarboxylic acid and from 0.5 to 5 percent by weight of the polyesters of a polymer derived from meta diisopropylbenzene diol or para diisopropylbenzene diol, meta diisopropenylbenzene, para diisopropenylbenzene, para tertiary butyl styrene and a polymer of meta or para diisopropenylbenzene terminated by α-methyl styrene.
Claim 4
Dependent Claim
72 words
A composition comprising polyethylene terephthalate polyester and copolyesters thereof containing up to 15 mol percent of an acid selected from the group consisting of a saturated aliphatic dicarboxylic acid and from 0.5 to 5 percent by weight of the polyesters of a polymer derived from meta diisopropylbenzene diol or para diisopropylbenzene diol, meta diisopropenylbenzene, para diisopropenylbenzene, para tertiary butyl styrene and a polymer of meta or para diisopropenylbenzene terminated by α-methyl styrene.
Claim 5
Dependent Claim
12 words
The composition of claim 1 in the form of a molded product.
Claim 6
Dependent Claim
50 words
The process of improving the moldability of polyethylene terephthalate which comprises mixing with polyethylene terephthalate from 0.5 to 5.0 percent by weight of a polymer derived from a material selected from the group consisting of meta diisopropylbenzene diol, para diisopropylbenzene diol, meta diisopropenylbenzene, para diisopropenylbenzene and para tertiary butyl styrene.
Claim 7
Dependent Claim
50 words
The process of improving the moldability of polyethylene terephthalate which comprises mixing with polyethylene terephthalate from 0.5 to 5.0 percent by weight of a polymer derived from a material selected from the group consisting of meta diisopropylbenzene diol, para diisopropylbenzene diol, meta diisopropenylbenzene, para diisopropenylbenzene and para tertiary butyl styrene.
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) | 1981-07-03 | 1982-01-02 | 1982-07-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1985-07-03 | 1986-01-02 | 1986-07-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1989-07-03 | 1990-01-02 | 1990-07-04 | $7700.00 | Window Closed / Lapsed |