Patent ID: 8076401

Claim:
A polymer blend which cures to a transparent solid polymer, comprising: A) alkoxysilane-terminated polymer(s) (A) having a main chain and at least one end group of the formula (1) -A-(CH 2 ) m —SiR 1 a (OR 2 ) 3-a (1) where A each independently is a divalent linker group selected from the group consisting of —O—, —S—, —O—CO—N(R 3 )—, —N(R 3 )—CO—O—, —N(R 3 )—CO—NH—, —NH—CO—N(R 3 )—, and —N(R 3 )—CO—N(R 3 )—, R 1 is an optionally halogen-substituted alkyl, cycloalkyl, alkenyl or aryl radical having 1 up to 10 carbon atoms, R 2 is an alkyl radical having 1-6 carbon atoms or an ω-oxaalkyl-alkyl radical having in total 2-10 carbon atoms, R 3 is hydrogen, an optionally halogen-substituted cyclic, linear or branched C 1 to C 18 alkyl or C 2 to C 18 alkenyl radical or a C 6 to C 18 aryl radical, a is an integer from 0 to 2, and m is 1, B) fumed or precipitated silica having a BET surface area of at least 50 m 2 /g, and C) a catalyst with not more than 0.05% by weight of amino compounds, and no other fillers.