US3981838A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Lubricant for polyvinyl chloride
Assignee: BP Corp North America Inc
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Filing: 1975-11-28
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Granted: 1976-09-21
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Expires: 1995-11-28
Abstract
Abstract Trimellitic acid di- and tri- diesters, di-ester salts and a mixture of oligomers are used as both internal and external lubricants in processing polyvinyl chloride.
Inventors
- 👤 Alfred P. Wilson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 23:37
CPC Classifications
C; C08; C08K; C08K5/00; C08K5/04; C08K5/10; C08K5/12; C08L; C08L27/00; C08L27/02; C08L27/04; C08L27/06; C08L67/00
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
156 words
In extrusion of a rigid polymer selected from the group consisting of vinyl chloride polymer, vinyl chloride-vinyl acetate copolymer, acrylonitrile-butadiene-styrene terpolymer and methylmethacrylate-butadiene-styrene terpolymer, whereby the polymer is forced through an orifice to produce a continuously formed profile, the improvement comprising adding to the polymer before extrusion an effective internal and external lubricating amount of up to 4 phr of a reaction product of (a) trimellitic acid, trimellitic anhydride or a mixture thereof and (b) a dihydric alcohol, in a molar ratio between 1.6 to 1 and 4.0 to 1, and (c) one or more aliphatic mono alcohols, such product having the formulae: ##SPC6## wherein such product comprises a mixture of a plurality of species with x = 0, 1, 2, 3 or 4 and where A is an aliphatic diradical containing 2 to 10 carbon atoms, R is individually selected from the group consisting of alkyl radicals containing 16 to 35 carbon atoms and hydrogen.
Claim 2
Dependent Claim
156 words
In extrusion of a rigid polymer selected from the group consisting of vinyl chloride polymer, vinyl chloride-vinyl acetate copolymer, acrylonitrile-butadiene-styrene terpolymer and methylmethacrylate-butadiene-styrene terpolymer, whereby the polymer is forced through an orifice to produce a continuously formed profile, the improvement comprising adding to the polymer before extrusion an effective internal and external lubricating amount of up to 4 phr of a reaction product of (a) trimellitic acid, trimellitic anhydride or a mixture thereof and (b) a dihydric alcohol, in a molar ratio between 1.6 to 1 and 4.0 to 1, and (c) one or more aliphatic mono alcohols, such product having the formulae: ##SPC6## wherein such product comprises a mixture of a plurality of species with x = 0, 1, 2, 3 or 4 and where A is an aliphatic diradical containing 2 to 10 carbon atoms, R is individually selected from the group consisting of alkyl radicals containing 16 to 35 carbon atoms and hydrogen.
Claim 3
Dependent Claim
13 words
The improvement of claim 1 wherein the rigid polymer is vinyl chloride polymer.
Claim 4
Dependent Claim
16 words
The improvement of claim 2 wherein the alkyl radicals contain from 16 to 28 carbon atoms.
Claim 5
Dependent Claim
29 words
The improvement of claim 3 wherein the molar ratio of trimellitic acid, trimellitic anhydride or mixture thereof to dihydric alcohol is between 1.9 to 1 to 2.1 to 1.
Claim 6
Dependent Claim
14 words
The improvement of claim 4 wherein the reaction product is formed from trimellitic anhydride.
Claim 7
Dependent Claim
24 words
The improvement of claim 5 wherein the dihydric alcohol is neopentyl glycol and wherein the alkyl radicals contain from 16 to 20 carbon atoms.
Claim 8
Dependent Claim
23 words
The improvement of claim 6 wherein the reaction product comprises a mixture of species with x equal to 0, 1, 2 and 3.
References Cited (Backward Citations)
US3280063A
Cited
US3654211A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1979-09-21 | 1980-03-22 | 1980-09-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-09-21 | 1984-03-22 | 1984-09-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-09-21 | 1988-03-22 | 1988-09-21 | $7700.00 | Window Closed / Lapsed |