TRANSPARENT POLYMER MIXTURES WHICH CONTAIN ALKOXYSILANE-TERMINATED POLYMERS
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Abstract
Room temperature, moisture curable, transparent, and non-yellowing polymer blends contain at least one alkoxysilyl-terminated polymer bearing an end group
-A-(CH2)m—SiR1a—(OR2)3-a
where A is a divalent linker group, contain a silica filler of high surface area as the sole filler, and is catalyzed by a catalyst which is free or substantially free of amine groups.
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Citations
15 Claims
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1-7. -7. (canceled)
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8. A polymer blend, comprising:
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A) alkoxysilane-terminated polymer(s) (A) having a main chain and at least one end group of the formula (1)
-A-(CH2)m—
SiR1a(OR2)3-a
(1)
whereA each independently is a divalent linker group selected from the group consisting of —
O—
, —
S—
, —
(R3)N—
, —
O—
CO—
N(R3)—
, —
N(R3)—
CO—
O—
, —
N(R3)—
CO—
NH—
, —
NH—
CO—
N(R3)—
, and —
N(R3)—
CO—
N(R3)—
,R1 is an optionally halogen-substituted alkyl, cycloalkyl, alkenyl or aryl radical having 1 up to 10 carbon atoms, R2 is an alkyl radical having 1-6 carbon atoms or an w-oxaalkyl-alkyl radical having in total 2-10 carbon atoms, R3 is hydrogen, an optionally halogen-substituted cyclic, linear or branched C1 to C18 alkyl or C2 to C18 alkenyl radical or a C6 to C18 aryl radical, a is an integer from 0 to 2, and m is an integer from 1 to 6, B) fumed or precipitated silica having a BET surface area of at least 50 m2/g, and C) a catalyst with not more than 0.05% by weight of amino compounds, and no other fillers. - View Dependent Claims (9, 10, 11, 12, 13, 14, 15)
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Specification