Superior thermal transfer adhesive

Details Superior thermal transfer adhesive Superior thermal transfer adhesive

1994-01-06

1994-11-22

Bleutge, John C.

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

Synthetic resins

Processes of preparing a desired or intentional composition...

523466, 525484, C08K 322, C08K 336, C09J16302, C09J16304, C08G 5908, C08G 5936, C08G 5938

Patent

active

053670060

ABSTRACT:
A superior thermal transfer film adhesive comprises the following composition: (a) at least one aliphatic epoxy resin; (b) a stoichiometric amount of at least one aliphatic polyamine curative; (c) an effective amount of a thixotropic agent, such as fumed silica; and (d) about 20 to 50 volume percent of at least one filler, such as alumina, based on the total of the epoxy resin and the curative. The aliphatic epoxy resin has aliphatic pendant chains of 6 to 20 carbon atoms in length. The curative comprises a long chain aliphatic or cycloaliphatic curing agent for the epoxy resin. Since aliphatic moieties, which are flexible, are used, the glass transition temperature of the resulting cured material is lower than epoxies and plasticizers employing rigid moieties. The adhesive of the invention is novel in attaining high volume resistivity (at least 10.sup.14 ohm-cm at 25.degree. C.), low temperature flexibility (-55.degree. C.), excellent adhesion for maximum thermal transfer, and ease of reworkability.

REFERENCES:
patent: 3256135 (1966-06-01), Weinheimer
patent: 4195001 (1980-03-01), Lytton
patent: 4304694 (1981-12-01), Scola
patent: 4525542 (1985-06-01), DeGooyer
patent: 4798761 (1989-01-01), Wykowski
patent: 4866108 (1989-09-01), Vachon et al.
H. Lee & K. Neville, "Handbook of Epoxy Resins", McGraw-Hill Book Co, N.Y., Reissue 1982, pp. 6/22, 16/1-7 and 10/2.

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