Patent ID: 7695651

Claim:
A flame retardant additive, comprising: (A) 80 to 99.8% by weight of a gassing agent selected from the group consisting of compounds containing both phosphorus and nitrogen atoms and mixtures of a phosphorus-containing compound and a nitrogen-containing compound: and (B) 0.2 to 20% by weight of a silicone-base water repellent treating agent comprising a co-hydrolytic condensate obtained through co-hydrolytic condensation of (i) 100 parts by weight of an organosilicon compound of the general formula (1) and (ii) 0.5 to 49 parts by weight of an amino group-containing alkoxysilane of the general formula (2) or a partial hydrolyzate thereof, and (iii) 0.1 to 20 parts by weight of a bis(alkoxysilyl) group-containing compound of the general formula (3) or a partial hydrolyzate thereof in the presence of an organic or inorganic acid, (R 1 ) a (OR 2 ) b SiO (4-a-b)/2 (1) wherein R 1 is a C 1 -C 6 alkyl group, R 2 is a C 1 -C 4 alkyl group, a is a positive number of 0.75 to 1.5, b is a positive number of 0.2 to 3, wherein 0.9<a+b≦4, R 3 R 4 NR 5 —SiR 6 n (OR 2 ) 3-n (2) wherein R 2 is as defined above, R 3 and R 4 are each independently hydrogen or a C 1 -C 15 alkyl or aminoalkyl group, R 5 is a divalent C 1 -C 18 hydrocarbon group, R 6 is a C 1 -C 4 alkyl group, and n is 0 or 1, (R 1 ) k (OR 2 ) 3-k Si—Y—Si(R 1 ) k (OR 2 ) 3-k (3) wherein R 1 and R 2 are as defined above, Y is —R—(SiR 7 2 O) m —SiR 7 2 —R—, R 7 is a C 1 -C 6 alkyl group, R is a divalent C 1 -C 6 hydrocarbon group, m is an integer of 1 to 9, and k is 0 or 1.