US4433097A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Vinyl chloride resin talc-embedded composition and method of manufacturing same
Assignee: Kanegafuchi Chemical Industry Co Ltd
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Filing: 1981-01-21
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Granted: 1984-02-21
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Expires: 2001-01-21
Abstract
Abstract Composition and method of manufacturing same, wherein a vinyl chloride resin has talc therein in direct contact with vinyl chloride based polymer particles without any intervening material therebetween.
Inventors
- 👤 Yoshihisa Tawada
- 👤 Tetsuro Yamamoto
- 👤 Minoru Ushioda
- 👤 Kazuo Saito
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 15:14
CPC Classifications
C; C08; C08F; C08F14/00; C08F14/02; C08F14/04; C08F14/06
Claims Analysis
Total Claims: 19
Claim 1
Independent Claim
91 words
A method of manufacturing vinyl chloride resin composition wherein talc is embedded within vinyl chloride base particles, comprising the steps of mixing said talc with either vinyl chloride monomer or a mixture of a vinyl chloride monomer in major proportions and other vinyl type monomer copolymerizable therewith in minor proportions, until said talc is substantially wetted with said monomer or monomer mixture; then adding to the resulting blend an aqueous medium and optionally a dispersant; and then polymerizing the resulting blend using an initiator soluble in said monomer or monomer mixture.
Claim 2
Independent Claim
91 words
A method of manufacturing vinyl chloride resin composition wherein talc is embedded within vinyl chloride base particles, comprising the steps of mixing said talc with either vinyl chloride monomer or a mixture of a vinyl chloride monomer in major proportions and other vinyl type monomer copolymerizable therewith in minor proportions, until said talc is substantially wetted with said monomer or monomer mixture; then adding to the resulting blend an aqueous medium and optionally a dispersant; and then polymerizing the resulting blend using an initiator soluble in said monomer or monomer mixture.
Claim 3
Dependent Claim
31 words
The method of claim 1, wherein a compound having a polar group and soluble in said monomer or monomer mixture is dissolved in said monomer or monomer mixture prior to polymerization.
Claim 4
Dependent Claim
25 words
The method of claim 2, wherein said polar group is a member selected from the group consisting of carboxylic acid, alcohol, amide and derivatives thereof.
Claim 5
Dependent Claim
20 words
The method of claim 1, wherein said talc comprises not more than 20% of particles having Stokes diameters exceeding 10μ.
Claim 6
Dependent Claim
36 words
The method of claim 1, wherein said initiator is alternatively mixed in said talc prior to said wetting, or dissolved in said monomer or monomer mixture, or blended in said resultant blend prior to said polymerization.
Claim 7
Dependent Claim
18 words
The method of claim 1, wherein water is adhered to said talc in an amount below 1 percent.
Claim 8
Dependent Claim
29 words
The method of claim 1, wherein said mixing of said talc with said monomer or monomer mixture is done by vigorous agitation to provide ample wetting of said talc.
Claim 9
Dependent Claim
26 words
The method of claim 1, wherein the said polymerization is started within one hour of said mixing of said talc with said monomer or monomer mixture.
Claim 10
Dependent Claim
16 words
The method of claim 1, wherein said initiator is an organic peroxide or an azo compound.
Claim 11
Dependent Claim
14 words
The method of claim 1, wherein said dispersant is a water soluble high polymer.
Claim 12
Dependent Claim
43 words
The method of claim 1, wherein at the time of mixing of said talc and said monomer or monomer mixture, an amide compound in an amount of from 0.1 to 25% based on the weight of said talc, is added prior to polymerization.
Claim 13
Independent Claim
106 words
A method of molding polyvinyl chloride resin containing talc, comprising the steps of mixing said talc with either vinyl chloride monomer or a mixture of vinyl chloride monomer in major proportion and other vinyl type monomer copolymerizable therewith in minor proportion, until said talc is substantially wetted with said monomer or monomer mixture; adding to the resulting blend an aqueous medium and optionally a dispersant; polymerizing the resulting blend using an initiator soluble in said monomer or monomer mixture; adding a stabilizer and a slidant to the polymerization product, and molding same; and wherein the talc content is limited to between 1 and 30 weight percent.
Claim 14
Independent Claim
106 words
A method of molding polyvinyl chloride resin containing talc, comprising the steps of mixing said talc with either vinyl chloride monomer or a mixture of vinyl chloride monomer in major proportion and other vinyl type monomer copolymerizable therewith in minor proportion, until said talc is substantially wetted with said monomer or monomer mixture; adding to the resulting blend an aqueous medium and optionally a dispersant; polymerizing the resulting blend using an initiator soluble in said monomer or monomer mixture; adding a stabilizer and a slidant to the polymerization product, and molding same; and wherein the talc content is limited to between 1 and 30 weight percent.
Claim 15
Dependent Claim
19 words
The method of claim 12, wherein the resulting particles of talc containing polyvinyl chloride are 100 mesh or smaller.
Claim 16
Dependent Claim
113 words
A vinyl chloride resin composition, comprising talc embedded within particles formed by polymerizing vinyl chloride monomer or a mixture of vinyl chloride monomer in major proportion and a vinyl type other monomer copolymerizable therewith in minor proportion; said talc is first mixed with either said monomer or said mixture until said talc is substantially wetted with said monomer or monomer mixture, then an aqueous medium is added to the resulting blend, and then polymerized; and wherein said talc has a size distribution wherein not more than 20 percent of said talc particles exceed Stokes diameter of 10μ; and wherein said talc content of the resulting composition is from 1 to 30 weight percent.
Claim 17
Dependent Claim
113 words
A vinyl chloride resin composition, comprising talc embedded within particles formed by polymerizing vinyl chloride monomer or a mixture of vinyl chloride monomer in major proportion and a vinyl type other monomer copolymerizable therewith in minor proportion; said talc is first mixed with either said monomer or said mixture until said talc is substantially wetted with said monomer or monomer mixture, then an aqueous medium is added to the resulting blend, and then polymerized; and wherein said talc has a size distribution wherein not more than 20 percent of said talc particles exceed Stokes diameter of 10μ; and wherein said talc content of the resulting composition is from 1 to 30 weight percent.
Claim 18
Dependent Claim
24 words
The composition of claim 14, wherein the resulting composition is mixed with polyvinyl chloride containing not more than 1 percent by weight of talc.
Claim 19
Dependent Claim
23 words
The composition of claim 14, wherein the talc containing composition is mixed with a polyvinyl chloride having no substantial amount of talc therein.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1987-02-20 | 1987-08-22 | 1988-02-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1991-02-20 | 1991-08-22 | 1992-02-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1995-02-20 | 1995-08-22 | 1996-02-21 | $7700.00 | Window Closed / Lapsed |