Patent ID: 8828551

Claim:
A process for improving the combing strength and the tear strength of a woven, knitted or nonwoven fibrous support, comprising the following steps: a) preparing a curable silicone coating composition comprising: (1) a polyorganosiloxane blend that is curable by polyaddition reactions, said blending comprising: at least one polyorganosiloxane (I) containing, per molecule, at least two C2-C6 alkenyl groups linked to silicon, and at least one polyorganosiloxane (II) containing, per molecule, at least two hydrogen atoms linked to silicon, (2) an effective amount of curing catalyst comprising at least one metal (or compound containing a metal) of the platinum group, (3) optionally, at least one adhesion promoter (IV), and (4) an additive system for improving the combing strength and the tear strength, said additive system comprising a pre-mix of: at least one polyorganosiloxane resin (V), optionally mixed with at least one polyorganosiloxane serving as diluent, and calcium carbonate (CaCO 3 ); wherein said at least one polyorganosiloxane resin (V) is present in a non-zero amount of up to 60% by weight relative to the total weight of the curable silicone coating composition and calcium carbonate is present from 10% to 24% by weight relative to the total weight of curable silicone coating composition; b) applying to one or two faces of a woven, knitted or nonwoven fibrous support at least 10 g/m 2 of the curable silicone coating composition prepared in step a), and c) curing the curable silicone coating composition applied in step b) to form an elastomer by heating to a temperature up to 210° C., optionally by electromagnetic radiation to form a support comprising a cured silicone composition, said support comprising said cured silicone composition having in combing strength relative to a comparable composition having ground quartz in place of calcium carbonate where said increase in combing strength occurs when said support comprises a conventional support used for making an airbag and when said support comprises an open contexture.