| 摘要 |
An aspect of the description is directed to hydrolysable silane graft propylene-α-olefin copolymers useful for moisture curable sealants, the copolymers comprising a propylene-α-olefin copolymer component comprising propylene-derived units and from 5 to 35 wt %, by weight of the propylene-α-olefin copolymer, of ethylene-derived units or a C4 to C10 α-olefin-derived unit, and having, in one embodiment, the following features: a density of from 0.850 to 0.920 g/cm3; a MWD of from 1.5 to 20; an Hf of less than or equal to 75 J/g; a Tm of from 25 to 105° C.; and a triad tacticity by 13C NMR of 75% or greater; and a hydrolysable silane component. The graft copolymer can be combined with oil and/or a thermoplastic to form a graft copolymer composition capable of being cross-linked by exposure to moisture. |
| 主权项 |
1. A graft copolymer composition comprising a hydrolizable silane graft propylene-α-olefin copolymer, the composition comprising:
a hydrolizable silane graft propylene-α-olefin copolymer comprising a propylene-α-olefin copolymer component and a hydrolizable silane component, and from 0.1 to 5 wt %, based on total weight of the hydrolizable silane graft propylene-α-olefin copolymer, of at least one silanol condensation catalyst: wherein the propylene-α-olefin copolymer component comprises propylene-derived units and from 5 to 20 wt %, by weight of the propylene-α-olefin copolymer, of ethylene-derived units or C4 to C10 α-olefin-derived units, and having: (i) a density of from 0.850 to 0.920 g/cm3; (ii) a MWD of from 1.5 to 20; (iii) an Hf of less than or equal to 75 J/g; (iv) a Tm of from 25 to 105° C.; (v) a triad tacticity by 13C NMR of 75% or greater; (vi) a melt flow rate (2.16 kg, 230° C.) of from 0.2 to 100 dg/min; (vii) a weight average molecular weight of 50,000 to 400,000; and (viii) a number average molecular weight of 25,000 to 200,000; and wherein the cured graft copolymer composition comprising the hydrolizable silane graft copolymer has an Elongation at Break as determined by ISO-37 (500 mm/min, 23° C.) greater than 400%; wherein the hydrolizable silane component is derived from a vinyl silane having the following formula: YSiRR″2, wherein Y is selected from vinyl terminated radicals, each R″ is independently selected from hydrolizable organic radicals; and R can be an R″ radical, or selected from C1 to C10 alkyl radicals (both R and R″ are bound to the silicon atom); and wherein the graft copolymer has a haze value of from less than 15%. |
