| 主权项 |
1. A room temperature curable organopolysiloxane composition which has strength in an uncured state of at least 600 Pa measured after one minute, the composition consisting essentially of:
a) from 20 to 45% by weight of an organopolysiloxane polymer having a viscosity of at least 1000 mPa·s at 25° C. and not less than two silicon-bonded hydroxyl groups and/or silicon bonded hydrolysable groups; b) a precipitated calcium carbonate filler; c) from 0.1 to 3% by weight of a metal containing condensation catalyst; d) from 0.1 to 10% by weight of a cross-linker adapted to react with component (a), catalysed with component (c); e) one or more rheology modifiers; f) 0 to 10% by weight of the composition of one or more extenders or plasticisers; and
wherein component e) is chosen from silicone organic co-polymers based on polyols of polyethers or polyesters, polyethylene glycol, polypropylene glycol, ethoxylated castor oil, oleic acid ethoxylate, alkylphenol ethoxylates, copolymers of ethylene oxide (EO) and propylene oxide (PO), silicone polyether copolymers, carboxylated liquid polyolefins, carboxylated liquid butadienes, silicone glycols, and fumed silica, and wherein component b) is present in an amount of from greater than 60 and up to 75% by weight of the total composition. |
