Patent US3899473A successfully refreshed from Google Patents.
US3899473A
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Method of incorporating solid additives into vinyl chloride polymers
Assignee: Norsk Hydro ASA
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Filing: 1972-03-10
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Granted: 1975-08-12
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Expires: 1992-03-10
Abstract
Abstract The present invention relates to a method of incorporating solid additives into vinyl chloride polymers. More precisely the invention relates to a method of incorporating said additives during the polymerization process which is commenced as a mass polymerization and completed as a suspension polymerization.
Inventors
- 👤 Bernt Eric Johansson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 14:16
CPC Classifications
C; C08; C08F; C08F14/00; C08F14/02; C08F14/04; C08F14/06
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
95 words
AN IMPROVED METHOD FOR INCORPORATING SOLID ADDITIVES IN VINYL CHLORIDE POLYMERS CONSISTING OF VINYL CHLORIDE AND UP TO 30% BY WEIGHT OF A COPOLYMERIZABLE MONOMER, WHICH COMPRISES: A. INTRODUCING THE MONOMERS TO BE POLYMERIZED INTO A FIRST ZONE TOGETHER WITH INSOLUBLE SOLID ADDITIVES HAVING A PARTICLE SIZE WITHIN THE RANGE 0.01 - 20 UM AND CARRYING OUT MASS POLYMERIZATION TO A CONVERSION UP TO 20%, B. ADDING WATER AND OTHER-WATER-SOLUBLE POLYMERIZATION AIDS TO THE PRODUCTS OF STEP A, AND C. CARRYING OUT SUPENSION POLYMERZATION UNTIL THE DESIRED DEGREE OF CONVERSATION OF THE MONOMERS BEEN OBTAINED.
Claim 2
Dependent Claim
95 words
AN IMPROVED METHOD FOR INCORPORATING SOLID ADDITIVES IN VINYL CHLORIDE POLYMERS CONSISTING OF VINYL CHLORIDE AND UP TO 30% BY WEIGHT OF A COPOLYMERIZABLE MONOMER, WHICH COMPRISES: A. INTRODUCING THE MONOMERS TO BE POLYMERIZED INTO A FIRST ZONE TOGETHER WITH INSOLUBLE SOLID ADDITIVES HAVING A PARTICLE SIZE WITHIN THE RANGE 0.01 - 20 UM AND CARRYING OUT MASS POLYMERIZATION TO A CONVERSION UP TO 20%, B. ADDING WATER AND OTHER-WATER-SOLUBLE POLYMERIZATION AIDS TO THE PRODUCTS OF STEP A, AND C. CARRYING OUT SUPENSION POLYMERZATION UNTIL THE DESIRED DEGREE OF CONVERSATION OF THE MONOMERS BEEN OBTAINED.
Claim 3
Dependent Claim
110 words
An improved method for incorporating solid additives in vinyl chloride polymers consisting of vinyl chloride and up to 30% by weight of a copolymerizable monomer, which comprises: a. introducing the monomers to be polymerized into a first zone together with between 10 and 60% by weight based on the monomers present of insoluble solid additives having a particle size within the range 0.01 - 20 Mu m and carrying out mass polymerization to a conversion up to 20%, b. adding water and other water-soluble polymerization aids to the products of step a, and c. carrying out suspension polymerization until the desired degree of conversion of the monomers has been obtained.
Claim 4
Dependent Claim
110 words
An improved method for incorporating solid additives in vinyl chloride polymers consisting of vinyl chloride and up to 30% by weight of a copolymerizable monomer, which comprises: a. introducing the monomers to be polymerized into a first zone together with between 10 and 60% by weight based on the monomers present of insoluble solid additives having a particle size within the range 0.01 - 20 Mu m and carrying out mass polymerization to a conversion up to 20%, b. adding water and other water-soluble polymerization aids to the products of step a, and c. carrying out suspension polymerization until the desired degree of conversion of the monomers has been obtained.
References Cited (Backward Citations)
US3151103A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-08-11 | 1979-02-10 | 1979-08-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-08-11 | 1983-02-10 | 1983-08-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-08-11 | 1987-02-10 | 1987-08-12 | $7700.00 | Window Closed / Lapsed |