CPC C08F 110/02 (2013.01) [C08F 10/02 (2013.01); C08J 3/28 (2013.01); C08K 5/14 (2013.01); C08L 23/26 (2013.01); C09D 5/00 (2013.01); C09D 7/63 (2018.01); C09D 123/26 (2013.01); H01B 3/441 (2013.01); H01B 13/0016 (2013.01); C08F 2810/20 (2013.01); C08J 2323/06 (2013.01); C08L 23/04 (2013.01); C08L 23/06 (2013.01); C08L 2023/44 (2013.01); C08L 2205/025 (2013.01); C08L 2207/066 (2013.01); C08L 2312/08 (2013.01); H01B 7/282 (2013.01); H01B 7/295 (2013.01)] | 7 Claims |
1. A method of free-radical curing a polyolefin composition to make a crosslinked polyolefin product, wherein the polyolefin composition comprises:
(A) a polyolefin polymer that is a low density polyethylene (LDPE) polymer comprising 50 to 100 weight percent (wt %) ethylenic monomeric units, 50 to 0 wt % (C3-C20)alpha-olefin-derived comonomeric units, and 20 to 0 wt % diene comonomeric units, wherein total weight percent is 100.00 wt %;
(B) a monocyclic organosiloxane of formula (I): [R1,R2SiO2/2]n (I), wherein subscript n is 4; each R1 is independently a (C2-C4)alkenyl or a H2C═C(R1a)—C(═O)—O—(CH2)m— wherein R1a is H or methyl and subscript m is an integer from 1 to 4; and each R2 is independently H, (C1-C4)alkyl, phenyl, or R1; and
(C) an organic peroxide;
with the proviso that the polyolefin composition is free of a phosphazene base; and with the proviso that the (A) polyolefin composition does not contain 24 wt % or more of an inorganic filler selected from the group consisting of aluminum oxide, aluminum silicate, calcium silicate, magnesium silicate, silica, titanium dioxide, and mixtures thereof; and
wherein the (B) monocyclic organosiloxane of formula (I) is described by any one of limitations (i) to (x): (i) each R1 is independently a (C2-C3)alkenyl; and each R2 is independently H, (C1-C2)alkyl, or (C2-C3)alkenyl; (ii) each R1 is vinyl; and each R2 is independently (C1-C2)alkyl; (iii) each R1 is vinyl; and each R2 is methyl; (iv) each R1 is allyl; and each R2 is independently (C1-C2)alkyl; (v) each R1 is allyl; and each R2 is methyl; (vi) each R1 is independently H2C═C(R1a)—C(═O)—O—(CH2)m— wherein R1a is H or methyl and subscript m is an integer from 1 to 4; and each R2 is independently H, (C1-C2)alkyl, or (C2-C3)alkenyl; (vii) each R1 is independently H2C═C(R1a)—C(═O)—O—(CH2)m— wherein R1a is H and subscript m is 3; and each R2 is independently (C1-C2)alkyl; (viii) each R1 is independently H2C═C(R1a)—C(═O)—O—(CH2)m— wherein R1a is methyl and subscript m is 3; and each R2 is independently (C1-C2)alkyl; (ix) the polyolefin composition does not contain 24 wt % or more of any inorganic filler;
and (x) a combination of limitation (ix) and any one of limitations (i) to (viii), the method comprising heating the polyolefin composition at a curing effective temperature with (C) an organic peroxide in such a way so as to react the (A) polyolefin polymer with the (B) monocyclic organosiloxane of formula (I), thereby making a crosslinked polyolefin product.
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