Thermosetting powder coating composition comprising vinyl interp

Details Thermosetting powder coating composition comprising vinyl interp Thermosetting powder coating composition comprising vinyl interp

1978-10-16

1981-01-13

Anderson, Harold D.

Synthetic resins or natural rubbers -- part of the class 520 ser

Synthetic resins

Mixing of two or more solid polymers; mixing of solid...

260 312N, 525336, 525386, C08L 3900

Patent

active

042450632

ABSTRACT:
A thermosetting powder coating composition is disclosed herein. The composition comprises a solid pulverulent mixture of (A) a substantially linear vinyl addition interpolymer having a plurality of pendant 2-oxazoline and/or 2-oxazine groups, a number average molecular weight of from about 5,000 to about 25,000, and a melting point of from about 60.degree. C. to 90.degree. C., and (B) a solid polycarboxylic acid melting in the range of 70.degree. C. to 175.degree. C. which is included in an amount of from 0.75 to 1.25 carboxy equivalents per pendant oxazoline or oxazine group on the interpolymer. The utility of the above composition as a powder coating is further enhanced by inclusion of a plasticizer (e.g., a long chain monocarboxylic acid) and in practice, the powder compositions also normally include pigments and minor amounts of flow control agents. The instant powder coatings are applied by conventional techniques and cured at temperatures normally in the range of from about 150.degree. C. to about 200.degree. C.

REFERENCES:
patent: 3216974 (1965-11-01), Gijzen
patent: 3505297 (1970-04-01), Sheetz et al.
patent: 3509235 (1970-04-01), Reimhofer et al.
patent: 3752793 (1973-08-01), Arlt et al.
patent: 3752870 (1973-08-01), Labana
patent: 4011381 (1977-03-01), Iwasawa et al.
Miller--The Structure of Polymers, 1966, pp. 20-23.
Chemical Abstracts, vol. 83, 1975, 99317q.

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