Benzoic acid terminated oligoesters as melt flow modifiers of th

Details Benzoic acid terminated oligoesters as melt flow modifiers of th Benzoic acid terminated oligoesters as melt flow modifiers of th

1975-11-26

1979-01-16

Kendall, Ralph S.

Coating processes

Solid particles or fibers applied

Uniting particles to form continuous coating with...

528305, 427 27, 427185, 427385R, 427385A, 427388R, 427397, 260 16, 260873, 106180, 428480, G08G 6318, G08L 6706

Patent

active

041350090

ABSTRACT:
The application discloses a mixture of high molecular weight hard resins, such as polymethyl methacrylate, cellulose acetate butyrate and cellulose nitrate with low molecular weight benzoic acid terminated polyesters having a glass transition temperature in the range of -30.degree. C. to 40.degree. C. and a molecular weight in the range of 500 to 1500. The hard polyesters of this invention are obtained by the use of small diols and hard dibasic acids in addition to termination of the chain by the hardening component benzoic acid. Saturated linear dicarboxylic acids are used for less than half of the acid monomer content, on a molar basis, since these are softening components. The polyesters are used to lower the melting point and improve the flow of the high molecular weight polymers without excessively plasticizing these high molecular weight polymers to the point where they are noticeably softened at use temperatures. In contrast, the usual polyesters contain high amounts of saturated dicarboxylic acids and are terminated with saturated fatty acids. The mixture is useful for coatings applied in the form of a powder, a solution or a dispersion. Molded and cast articles can also be made from this mixture. As used herein, "thermoplastic" includes thermosetting resins which go through a thermoplastic flowable stage before becoming thermoset.

REFERENCES:
patent: 2689799 (1954-09-01), Albus et al.
patent: 3574789 (1971-04-01), Bungs et al.
patent: 3668277 (1972-06-01), Riemhofer et al.
patent: 3850871 (1974-11-01), Walus
patent: 3867480 (1975-02-01), Fujiyoshi et al.
patent: 3953644 (1976-04-01), Camelon et al.
patent: 3954901 (1976-05-01), Watanabe et al.

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