US4826728A
Expired / Lapsed
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Rapid dissolving polymer compositions and uses therefor
Assignee: General Technology Applications Inc
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Filing: 1987-11-16
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Granted: 1989-05-02
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Expires: 2007-11-16
Abstract
Abstract A particulate, free-flowing and rapid dissolving polymer composition is prepared by comminuting a high molecular weight thermoplastic or viscoelastic polymer at a temperature below its glass transition temperature while maintaining the polymer in an inert environment. A finely divided, solid coating agent is mingled with the comminuted polymer while maintaining the polymer particles in a cold and inert atmosphere. The particles of coating agent form a protective shell around each polymer particle by tumble mixing the components while raising the temperature of the mixture. The polymer composition finds use as a drag reducing agent; as an anti-misting agent; to enhance the efficiency of oil skimming processes and devices; and for the preparation of polymer solutions for other uses.
Inventors
- 👤 Dion P. O'Mara
- 👤 Albert F. Hadermann
- 👤 Jerry C. Trippe
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 16:10
CPC Classifications
C; C09; C09K; C09K3/00; C09K3/32; C02; C02F; C02F1/00; C02F1/68; C02F1/681; C08; C08J; C08J3/00; C08J3/02; C08J3/09; C08J3/11; C08J3/12; C08J3/124; C10; C10L; C10L1/00; C10L1/10; C10L1/14; C10L1/16; C10L1/1625; C10L1/1633; C10L1/20; C10L1/206; C10L1/207; Y; Y10; Y10T; Y10T137/00; Y10T137/0318; Y10T137/0391; Y10T428/00; Y10T428/29; Y10T428/2982; Y10T428/2991; Y10T428/2993; Y10T428/2998; Y10T428/31504; Y10T428/3154; Y10T428/31544; Y10T428/31855; Y10T428/31931
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
72 words
A rapid dissolving, particulate, polymer composition comprising: a central core consisting of a solid polymer particle having clean surfaces; a multi-layered particulate coating agent entirely surrounding said core, the median diameter of the particles of said coating agent being less than one-tenth the diameter of said polymer core; and a gas filling the interstices between said coating agent particles and around said core, said gas being non-reactive toward said clean core surfaces.
Claim 2
Dependent Claim
72 words
A rapid dissolving, particulate, polymer composition comprising: a central core consisting of a solid polymer particle having clean surfaces; a multi-layered particulate coating agent entirely surrounding said core, the median diameter of the particles of said coating agent being less than one-tenth the diameter of said polymer core; and a gas filling the interstices between said coating agent particles and around said core, said gas being non-reactive toward said clean core surfaces.
Claim 3
Dependent Claim
54 words
The composition of claim 1 wherein said polymer comprises a natural or synthetic thermoplastic which imparts viscoelastic properties to a solution of said polymer in a solvent and wherein said clean polymer surfaces comprise fracture surfaces created by comminution in an inert atmosphere at a temperature below the glass transition temperature of said polymer.
Claim 4
Dependent Claim
17 words
The composition of claim 2 wherein said gas filling the interstices between coating agent particles is nitrogen.
Claim 5
Dependent Claim
38 words
The composition of claim 3 wherein said polymer is selected from the group consisiting of polyisobutylene, polyisoprene, polyalpha-olefins, polybutadiene, copolymers of styrene and butadiene, copolymers of ethylene and butene-1, copolymers of vinylidene fluoride and hexafluoropropylene and mixtures thereof.
Claim 6
Dependent Claim
30 words
The composition of claim 3 wherein said coating agent is selected from the group consisting of amorphous silicon dioxide, kaolin clay, calcined kaolin clay, graphite, Teflon powder and tricalcium phosphate.
Claim 7
Dependent Claim
19 words
The composition of claim 3 wherein the median diameter of said central core is less than about 0.075 .
Claim 8
Dependent Claim
22 words
The composition of claim 3 wherein the median particle diameter of said coating agent ranges from about 0.1 to about 10 micrometers.
Claim 9
Dependent Claim
23 words
The composition of claim 3 wherein said coating agent particles make up from about 20% to about 75% by weight of the composition.
Claim 10
Dependent Claim
28 words
The composition of claim 3 wherein said polymer is polyisobutylene and wherein said coating agent is selected from the group consisting of tricalcium phosphate, kaolin clay and graphite.
Claim 11
Dependent Claim
12 words
The composition of claim 9 wherein said coating agent is tricalcium phosphate.
Claim 12
Dependent Claim
20 words
The composition of claim 3 wherein said polymer is a fluorinated elastomer and wherein said coating agent is Teflon powder.
References Cited (Backward Citations)
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