Processes for preparing (METH) acrylic polymers having functional groups at the chain ends
AssigneeKaneka Corporation
InventorsMasato Kusakabe, Kenichi Kitano
Life of this patent
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Abstract
(Meth)acrylic polymers having alkenyl or curable silyl groups at the chain ends in high functionality ratios are prepared by a process which comprises (i) preparing a (meth)acrylic polymer having halogen atoms at the chain ends, using an organohalogenated compound or a halosulfonyl compound as an initiator and a metal complex catalyst wherein the central metal atom is selected from the group consisting of the elements of Groups 8, 9, 10 and 11 of the periodic table; and (ii) transforming the halogen atom into an alkenyl group- or a curable silyl group-containing substituent. The obtained (meth)acrylic polymers form homogeneous curing materials.
Claims14
A process for preparing a (meth)acrylic polymer having curable silyl groups at the chain ends, which comprises the steps of:
- (i) preparing a (meth)acrylic polymer having a chain end structure of formula (1)
- —CH2—C(R1)(CO2R2) (X) (1)
- wherein R1 is hydrogen or methyl;
- R2 is a C1-20 alkyl, C6-20 aryl or C7-20 aralkyl;
- X is chlorine, bromine or iodine;
- by polymerizing (meth)acrylate monomers using an organohalogenated compound or a halosulfonyl compound as an initiator and a metal complex catalyst wherein the central metal atom is selected from the group consisting of the elements of Groups 8, 9, 10 and 11 of the periodic table;
- and
- (ii) converting the halogen atom in the structure of formula (1) into a curable silyl group-containing substituent.
A process for preparing a (meth)acrylic polymer having curable silyl groups at the chain ends which comprises
- (i) preparing a (meth)acrylic polymer having a chain end structure of formula (1)
- —CH2—C(R1)(CO2R2)(X) (1)
- wherein R1 is hydrogen or methyl;
- R2 is a C1-20 alkyl, C6-20 aryl or C7-10 aralkyl;
- X is chlorine, bromine or iodine;
- by polymerizing (meth)acrylate monomers using an organohalogenated compound or a halosulfonyl compound as an initiator and a metal complex catalyst wherein the central metal atom is selected from the group consisting of the elements of Groups 8, 9, 10 and 11 of the periodic table;
- (ii) converting the halogen atom in the structure of formula (1) into an alkenyl group-containing substituent;
- and
- adding a curable silyl group-containing hydrogensilicon compound to the (meth)acrylic polymer having alkenyl groups at the chain ends.
Dependencies are inferred from the claim text.