Liquid catalyst for the polyaddition reaction of polyorganosiloxanes to vinyl and hydroxyl groups

摘要

The invention concerns the field of production of polyorganosiloxane compositions which are hardenable in mass and in the form of coatings and more particularly a liquid catalyst for the polyaddition reaction of polyorganosiloxanes with vinyl and hydroxyl groups. The liquid catalyst for the polyaddition reaction of polyorganosiloxanes with vinyl and hydroxyl groups consists of compounds in the following proportions (in parts by weight): 100 parts of chloroplatinic acid; 5 to 50 parts of a mixture of 50 to 65% of ethyl orthosilicate and 35 to 50% of hydrolysed ethyl orthosilicate; 4500 to 990,000 parts of toluene and 50 to 100,000 parts of methyl ethyl ketone.