Patent US4058495A successfully refreshed from Google Patents.
US4058495A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Preparation of high bulk density/low porosity PVC resins
Assignee: ExxonMobil Technology and Engineering Co
•
Filing: 1976-09-27
•
Granted: 1977-11-15
•
Expires: 1996-09-27
Abstract
Abstract A high bulk density/low porosity polyvinyl chloride resin which is highly processable and thermally stable is prepared by suspension polymerization wherein a vinyl chloride monomer is polymerized in the presence of: hydroxyethyl cellulose; an internal lubricant-type long chain compound such as butyl stearate; and a water insoluble/monomer soluble initiator such as lauryl peroxide, and wherein the polymerization is performed under low shear conditions in the presence of a minimum amount of oxygen.
Inventors
- 👤 Joseph Serratore
- 👤 Laurence F. King
- 👤 Thomas H. Sutherland
- 👤 James R. Wallace
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 16:06
CPC Classifications
C; C08; C08K; C08K5/00; C08K5/04; C08K5/05; C08K5/09; C08K5/10; C08K5/101; C08L; C08L27/00; C08L27/02; C08L27/04; C08L27/06; C08L51/00; C08L51/02; C08L91/00; C08L91/06; Y; Y10; Y10S; Y10S526/00; Y10S526/91
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
65 words
A polyvinyl chloride resin having a bulk density in excess of 0.65 g/ml, a porosity or plasticizer acceptance less than about 15 ml per 100g resin, a median particle size of about 0.01 to about 0.3 mm, wherein each resin particle consists essentially of polyvinyl chloride and a C 12 -C 35 aliphatic compound selected from the group consisting of alcohols, acids, esters and waxes.
Claim 2
Dependent Claim
65 words
A polyvinyl chloride resin having a bulk density in excess of 0.65 g/ml, a porosity or plasticizer acceptance less than about 15 ml per 100g resin, a median particle size of about 0.01 to about 0.3 mm, wherein each resin particle consists essentially of polyvinyl chloride and a C 12 -C 35 aliphatic compound selected from the group consisting of alcohols, acids, esters and waxes.
Claim 3
Dependent Claim
24 words
The resin of claim 1 wherein the aliphatic compound is selected from the group consisting of C 3 -C 5 alkyl stearates and palmitates.
Claim 4
Dependent Claim
21 words
The resin of claim 1 wherein the aliphatic compound contains about 16 to about 30 carbon atoms in its longest chain.
Claim 5
Dependent Claim
19 words
The resin of claim 3 wherein the porosity is about 5 to about 15 ml per 100 g resin.
Claim 6
Dependent Claim
16 words
The resin of claim 4 wherein the bulk density is about 0.65 to about 0.85 g/ml.
Claim 7
Dependent Claim
16 words
The resin of claim 1 wherein the aliphatic compound is a liquid at about 40° C.
Claim 8
Dependent Claim
16 words
The resin of claim 5 wherein the aliphatic compound is a liquid at about 40° C.
Claim 9
Independent Claim
82 words
A method of producing a high bulk density/low porosity polyvinyl chloride resin which comprises suspension polymerizing vinyl chloride in the presence of about 0.1 to about 5 parts of C 12 -C 35 aliphatic alcohol, aliphatic acid, aliphatic ester or wax, a monomer soluble/water insoluble initiator and about 0.02 to about 0.5 parts of hydroxyethyl cellulose wherein said parts are based on 100 parts of vinyl chloride monomer and wherein said polymerization is performed in an unbaffled reactor under low shear conditions.
Claim 10
Independent Claim
82 words
A method of producing a high bulk density/low porosity polyvinyl chloride resin which comprises suspension polymerizing vinyl chloride in the presence of about 0.1 to about 5 parts of C 12 -C 35 aliphatic alcohol, aliphatic acid, aliphatic ester or wax, a monomer soluble/water insoluble initiator and about 0.02 to about 0.5 parts of hydroxyethyl cellulose wherein said parts are based on 100 parts of vinyl chloride monomer and wherein said polymerization is performed in an unbaffled reactor under low shear conditions.
Claim 11
Dependent Claim
23 words
The method of claim 8 wherein the amount of aliphatic compound used is 0.1 to about 5 parts per 100 parts of monomer.
Claim 12
Dependent Claim
23 words
The method of claim 8 wherein the amount of initiator used is about 0.01 to about 0.3 parts per 100 parts of monomer.
References Cited (Backward Citations)
US3813373A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1980-11-14 | 1981-05-16 | 1981-11-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-11-14 | 1985-05-16 | 1985-11-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-11-14 | 1989-05-16 | 1989-11-15 | $7700.00 | Window Closed / Lapsed |