Synthetic resins or natural rubbers -- part of the class 520 ser – Synthetic resins – Treating polymer containing material or treating a solid...
Patent
1980-05-15
1982-01-05
Levin, Stanford M.
Synthetic resins or natural rubbers -- part of the class 520 ser
Synthetic resins
Treating polymer containing material or treating a solid...
525 59, 525 60, 525 61, 525 62, 52894;, C08F 622
Patent
active
043095259
ABSTRACT:
A spherical powder of a hydrolyzed ethylene-vinyl acetate copolymer or its carboxyl modified product, is prepared by a method which comprises mixing 100 parts by weight of (1) a hydrolyzed product of an ethylene-vinyl acetate copolymer having 5 to 50% by weight of vinyl acetate group content or (2) a carboxyl modified product of the aforementioned hydrolyzed product obtained by reacting said hydrolyzed product with an unsaturated carboxylic acid or cyclic acid anhydride, with 10 to 100 parts by weight of an organic solvent capable of dissolving said hydrolyzed product or its carboxyl modified product, the solvent being not freely miscible with water and having a boiling point of not lower than 80.degree. C., 300 to 1000 parts by weight of water and 0.1 to 10 parts by weight of an alkylphenol ethylene oxide adduct having an HLB value of 10 to 20, emulsifying said mixture while it is maintained at a temperature of not lower than the softening point of said hydrolyzed product or carboxyl modified product, and decreasing the temperature of the system under stirring down to not higher than said softening point. The resultant powder is virtually spherical in its particle form, the particles are of almost equal size, and their particle size distribution is such that not less than 70% fall between 70 and 300.mu.. Such spherical powder, when used in electrostatic coating, can provide beautiful coating films.
REFERENCES:
patent: 3622555 (1971-11-01), Rothenbury et al.
patent: 3972865 (1976-08-01), McClain et al.
patent: 4027079 (1977-05-01), McClain et al.
patent: 4212966 (1980-07-01), McClain
Doura Fumihiro
Furukawa Yuzo
Nakabayashi Masamitsu
Levin Stanford M.
Takeda Chemical Industries Ltd.
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