Molding compounds having low durometer and high tear strength

Details Molding compounds having low durometer and high tear strength Molding compounds having low durometer and high tear strength

1994-07-27

1995-03-14

Marquis, Melvyn I.

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

Synthetic resins

Processes of preparing a desired or intentional composition...

524731, 524783, 524789, 524791, 524786, 524860, 524863, C08K 906, C08L 8304

Patent

active

053978170

ABSTRACT:
Silicone mold compositions are provided which exhibit low durometer and high tear strength properties and comprise a main filler of precipitated silica and a reinforcing co-filler selected from acicular CaSiO.sub.3 fillers, fumed aluminum oxide fillers, and spherical ceramic fillers. The co-fillers have large surface areas and small particle sizes. The co-fillers are used with alkoxy silane cross-linking agents of the formula (RO).sub.4 Si, particularly n-propylsilicate. Two-part silicone cure systems are provided which enable the rapid achievement of full die B tear strengths without the need for prolonged aging of these materials.

REFERENCES:
patent: 2938009 (1960-03-01), Lucas
patent: 3635743 (1972-01-01), Smith
patent: 3696127 (1972-10-01), Matherly
patent: 4782107 (1988-11-01), Lagarde

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