US3764638A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Processing aids for polyvinyl chloride and methods for their preparation
Assignee: Stauffer Chemical Co
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Filing: 1970-07-09
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Granted: 1973-10-09
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Expires: 1990-07-09
Abstract
Abstract Relatively small proportions of acrylic monomer are added to a polyvinyl chloride emulsion and polymerization initiated with a water-soluble free radical catalyst. The product is useful especially as a processing aid for polyvinyl chloride.
Inventors
- 👤 J Hwa
- 👤 R Gallagher
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 18:05
CPC Classifications
C; C08; C08L; C08L27/00; C08L27/02; C08L27/04; C08L27/06; C08F; C08F259/00; C08F259/02; C08F259/04; C08L51/00; C08L51/003
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
33 words
The method of claim 1, wherein the polymer comprising the coating for said coated particles is present in a concentration of from about 20-40 percent of the total weight of said coated particles.
Claim 2
Dependent Claim
62 words
The method of claim 1, wherein the polymer comprising the coating for said coated particles is a polymer derived from about 80-100 percent, by weiGht, of at least one methacrylate monomer selected from the group consisting of methyl methacrylate, ethyl methacrylate and mixtures thereof and from about 0-20 percent, by weight, of at least one C1-C12 alkyl acrylate monomer and mixtures thereof.
Claim 3
Dependent Claim
37 words
The method of claim 3, wherein the polymer comprising the coating for said particles is a polymer derived from about 90 percent, by weight, of methyl methacrylate and from about 10 percent, by weight, of ethyl acrylate.
Claim 4
Dependent Claim
17 words
The method of claim 3, wherein the polymer comprising the coating for said particles is polymethyl methacrylate.
Claim 5
Dependent Claim
32 words
The method of claim 1, wherein said coated particles are admixed with said polyvinyl chloride in a concentration of from about 1-10 percent as based on the weight of said polyvinyl chloride.
Claim 6
Dependent Claim
212 words
A polyvinyl chloride resin composition displaying enhanced processing characteristics, said composition comprising an intimate admixture of emulsion grade polyvinyl chloride with a plurality of coated polyvinyl chloride resin particles having a coating thereon of a polymer derived from about 80-100 percent by weight of at least one methacrylate monomer selected from the group consisting of glycidyl methacrylate and the C1-C3 alkyl methacrylates and mixtures thereof and from about 0-20 percent by weight of at least one acrylate monomer selected from the group consisting of the C1-C12 alkyl acrylates and mixtures thereof, said coated particles being prepared by admixing said methacrylate monomer or monomers with a previously polymerized aqueous latex containing preformed polyvinyl chloride and polymerizing said monomer or monomers in the presence of a water soluble free radical catalyst while said monomer or monomers are admixed with said previously prepared aqueous latex of preformed polyvinyl chloride while maintaining the surface tension of the system at between about 40 dynes per square centimeter and about 60 dynes per square centimeter, the polymerization taking place, and, the polymer comprising the coating for said particles being present in and/or around the polyvinyl chloride core of said particles in a concentration of from about 10-50 percent of the total weight of said coated polyvinyl chloride particles.
Claim 7
Dependent Claim
35 words
The polyvinyl chloride resin composition of claim 7, wherein the polymer comprising the coating for said particles is present in a concentration of from about 20-40 percent of the total weight of said coated particles.
Claim 8
Dependent Claim
64 words
The polyvinyl chloride resin composition of claim 1, wherein the polymer comprising the coating for said particles is a polymer derived from about 80-100 percent, by weight, of at least one methacrylate monomer selected from the group consisting of methyl methacrylate, ethyl methacrylate and mixtures thereof and from about 0-20 percent, by weight, of at least one C1-C12 alkyl acrylate monomer and mixtures thereof.
Claim 9
Dependent Claim
40 words
The polyvinyl chloride resin composition of claim 9, wherein the polymer comprising the coating for said particles is a polymer derived from about 90 percent, by weight, of methyl methacrylate and from about 10 percent, by weight, of ethyl acrylate.
Claim 10
Dependent Claim
20 words
The polyvinyl chloride resin composition of claim 9, wherein the polymer comprising the coating for said particles is polymethyl methacrylate.
Claim 11
Dependent Claim
31 words
The polyvinyl chloride resin composition of claim 7, wherein said coated particles are present in a concentration of from about 1-10 percent as based on the weight of said polyvinyl chloride.
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) | 1976-10-08 | 1977-04-09 | 1977-10-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-10-08 | 1981-04-09 | 1981-10-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-10-08 | 1985-04-09 | 1985-10-09 | $7700.00 | Window Closed / Lapsed |