Thermoexpandable microcapsule and production

Details Thermoexpandable microcapsule and production Thermoexpandable microcapsule and production

1995-06-07

1999-01-19

Cooney, Jr., John M.

Stock material or miscellaneous articles

Coated or structually defined flake, particle, cell, strand,...

Particulate matter

264 455, 264 51, 264 55, 4284022, 42840221, 42840222, 521 51, 521 56, 521 60, 521 65, 521 72, 521142, B32B 516

Patent

active

058612149

ABSTRACT:
The object of the present invention is to provide a thermoexpandable microcapsule which can be expanded at a lower temperature without decrease of various properties such as chemical resistance and heat resistance; said thermoexpandable microcapsule contains at least two kinds of volatile expanding agents having different boiling points lower than softening temperature of a polymeric material forming a shell, production thereof; and a method of expanding the microcapsule in which it is subjected to first heating below the starting temperature of expanding and then to the second heating.

REFERENCES:
patent: 3398105 (1968-08-01), Roper et al.
patent: 3615972 (1971-10-01), MarcLouse, Jr. et al.
Patent Abstracts of Japan, vol. 12, No. 181 (C-499) May 27, 1988; and JP-A-62 286 534 published on Dec. 12, 1987.
Patent Abstracts of Japan, vol. 5, No. 147 (M-088) Sep. 17, 1981; and JP-A-56 077 192 published on Jun. 25, 1981.
Patent Abstracts, vol. 012, No. 181, (C-499) May 27, 1988, "Manufacture of Thermal Expansion Microcapsule".
Patent Abstracts of Japan, vol. 005, No. 147, (M-088) Sep. 17, 1981, "Visible Forming Sheet".

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