Patent US4481328A successfully refreshed from Google Patents.
US4481328A
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Pulverulent polymer composition, a process for its preparation and adhesive based thereon
Assignee: Clariant Produkte Deutschland GmbH
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Filing: 1982-01-15
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Granted: 1984-11-06
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Expires: 2002-01-15
Abstract
Abstract A pulverulent polymer composition which is readily pourable, has a low tendency to form dust and has good stability on storage is composed of a mixture of a vinyl ester polymer and a small proportion of a hydrophobic silica. The composition is prepared by spray drying an aqueous vinyl ester polymer dispersion in the presence of a hydrophobic silica. The silica is preferably a product from the reaction of a hydrophilic silica with an organochlorosilane. The composition can be redispersed in water and the films produced from such dispersions are transparent; they are suitable for the production of paints, glues and adhesives.
Inventors
- 👤 Albrecht Harreus
- 👤 Eduard Kaiser
- 👤 Detlev Seip
- 👤 Wolfgang Zimmermann
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 17:12
CPC Classifications
C; C08; C08J; C08J3/00; C08J3/12; C08J3/124; B; B29; B29B; B29B9/00; B29B9/10; C08K; C08K3/00; C08K3/34; C08K3/36; C08K9/00; C08K9/04; C08K9/06; C09; C09D; C09D131/00; C09D131/02; C09D131/04; C09J; C09J131/00; C09J131/02; C09J131/04; C08J2331/00; C08J2331/02; C08J2331/04; C08L; C08L2666/00; C08L2666/54; Y; Y10; Y10S; Y10S524/00; Y10S524/904
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
98 words
A pulverulent polymer composition obtained by spray drying of an aqueous polymer dispersion in the presence of a hydrophobic silica comprising 98.0 to 99.9 percent by weight of a water-dispersible vinyl ester polymer and 2.0 to 0.1 percent by weight of a hydrophobic silica, said vinyl ester polymer being a homopolymer of a vinyl ester having four, five or six carbon atoms or said vinyl ester polymer being a vinyl ester copolymer comprising a copolymer of vinyl acetate and a vinyl ester of a carboxylic acid having three to eighteen carbon atoms, a vinyl chloride or an ethylene.
Claim 2
Dependent Claim
98 words
A pulverulent polymer composition obtained by spray drying of an aqueous polymer dispersion in the presence of a hydrophobic silica comprising 98.0 to 99.9 percent by weight of a water-dispersible vinyl ester polymer and 2.0 to 0.1 percent by weight of a hydrophobic silica, said vinyl ester polymer being a homopolymer of a vinyl ester having four, five or six carbon atoms or said vinyl ester polymer being a vinyl ester copolymer comprising a copolymer of vinyl acetate and a vinyl ester of a carboxylic acid having three to eighteen carbon atoms, a vinyl chloride or an ethylene.
Claim 3
Dependent Claim
18 words
A polymer composition as claimed in claim 1 wherein the vinyl polyester polymer is a vinyl acetate homopolymer.
Claim 4
Dependent Claim
23 words
A polymer composition as claimed in claim 1, wherein the hydrophobic silica is a product from the reaction of silica with an organochlorosilane.
Claim 5
Dependent Claim
21 words
A polymer composition as claimed in claim 1, wherein the hydrophobic silica has a particle diameter of 10 to 50 nm.
Claim 6
Dependent Claim
23 words
A polymer composition as claimed in claim 1, wherein the hydrophobic silica has a surface area of 80 to 300 m 2 /g.
Claim 7
Dependent Claim
23 words
A polymer composition as claimed in claim 1, wherein the hydrophobic silica has a carbon content of 0.2 to 5 percent by weight.
Claim 8
Dependent Claim
110 words
A process for the preparation of a pulverulent, silica-containing polymer composition based on a water-dispersible vinyl ester polymer, which comprises spray drying an aqueous vinyl ester polymer dispersion having a solids content of 30 to 60 percent by weight, said vinyl ester polymer being a homopolymer of a vinyl ester having four, five or six carbon atoms or said vinyl ester polymer being a vinyl ester copolymer comprising a copolymer of vinyl acetate and a vinyl ester of a carboxylic acid having three to eighteen carbon atoms, a vinyl chloride or an ethylene, in the presence of a hydrophobic silica in a quantity of 0.1 to 2.0 percent by weight.
Claim 9
Dependent Claim
110 words
A process for the preparation of a pulverulent, silica-containing polymer composition based on a water-dispersible vinyl ester polymer, which comprises spray drying an aqueous vinyl ester polymer dispersion having a solids content of 30 to 60 percent by weight, said vinyl ester polymer being a homopolymer of a vinyl ester having four, five or six carbon atoms or said vinyl ester polymer being a vinyl ester copolymer comprising a copolymer of vinyl acetate and a vinyl ester of a carboxylic acid having three to eighteen carbon atoms, a vinyl chloride or an ethylene, in the presence of a hydrophobic silica in a quantity of 0.1 to 2.0 percent by weight.
Claim 10
Dependent Claim
18 words
A process as claimed in claim 7, wherein the silica is employed in admixture with a drying gas.
Claim 11
Dependent Claim
17 words
An adhesive composition consisting essentially of an aqueous dispersion including the polymer composition according to claim 1.
Claim 12
Dependent Claim
126 words
A pulverulent polymer composition, as claimed in claim 1, comprising a spray dried composition of 98.0 to 99.9 percent by weight of a water-dispersible vinyl ester polymer and 2.0 to 0.1 percent by weight of a hydrophobic silica, said vinyl ester polymer being a homopolymer of a vinyl ester having four, five or six carbon atoms or said vinyl ester polymer being a vinyl ester copolymer comprising a copolymer of vinyl acetate and a vinyl ester of a carboxylic acid having three to eighteen carbon atoms, a vinyl chloride or an ethylene, wherein the hydrophobic silica has a particle diameter of 10 to 50 nm, a surface area of 80 to 300 m 2 /g and a carbon content of 0.2 to 5 percent by weight.
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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) | 1987-11-06 | 1988-05-07 | 1988-11-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1991-11-06 | 1992-05-07 | 1992-11-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1995-11-06 | 1996-05-07 | 1996-11-06 | $7700.00 | Window Closed / Lapsed |