Accelerator system for crosslinking polymers which harden on exp

Details Accelerator system for crosslinking polymers which harden on exp Accelerator system for crosslinking polymers which harden on exp

1997-07-03

2000-09-26

Koslow, C. Melissa

Catalyst, solid sorbent, or support therefor: product or process

Catalyst or precursor therefor

Metal, metal oxide or metal hydroxide

502202, 502208, 502236, 502239, 502241, 502242, 502243, 502324, 502350, B01J 2300, B01J 2102, B01J 2108, B01J 2332

Patent

active

061242357

ABSTRACT:
An accelerator system for the cold crosslinking of polymers which harden on exposure to moisture by hydrolysis/condensation, comprising: (C) x parts by weight of a catalyst for crosslinking the said polymers by polycondensation, x ranging from 0.01 to 10; (E) Y parts by weight of a solid inorganic compound containing an amount y of water in the form of water of hydration and/or water adsorbed by capillary condensation, this amount y ranging from 0.5 to 40 parts by weight, and which can represent up to 70% of the weight of the said solid inorganic compound; (F) z parts by weight of fillers, z ranging from 0 to 50; (D) 100-(x+Y+z) parts by weight of a diluent or of a solvent of the said catalyst (C), the diluent or solvent having a dynamic viscosity at 25.degree. C. of the order of 50 to 200,000 mPa.s; the respective amounts of the four constituents (C), (E), (F) and (D) being such that the system obtained exists in the form of a manipulable paste. The accelerator system is used for accelerating silicone compositions which harden on exposure to the moisture in air.

REFERENCES:
patent: 4508888 (1985-04-01), Letoffe et al.
patent: 5264515 (1993-11-01), Cody et al.
patent: 5356980 (1994-10-01), Feder et al.

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