Composite membrane of a hydrophilic asymmetric membrane coated with an organosiloxane block copolymer
First Claim
1. A composite membrane comprising a hydrophilic asymmetric membrane coated with a mixture of:
- (a) a poly(methylvinyl)siloxane urethane block copolymer having the structural formula (I) depicted below;
##STR31## wherein;
m has a value of 8.0-18.0;
n has a value of 1.0-5.0;
x has a value of about 0.2 to about 0.7;
y has a value of 1 minus the value of x;
R is ##STR32## R1 is ##STR33## R2 is a C1 -C5 lower alkylene group;
v is a vinyl group; and
Me is a methyl group;
(b) a linking reagent; and
(c) a catalytically effective amount of a hydrosilylation catalyst.
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Abstract
An organosiloxane block copolymer having the formula depicted (I) depicted below: ##STR1## wherein: m has a value of 8.0-18.0;
n has a value of 1.0-5.0;
x has a value of about 0.2 to about 0.7;
y has a value of 1 minus the value of x;
R is ##STR2## R1 ##STR3## R2 is a C1 -C5 lower alkylene group; V is a vinyl group; and
Me is a methyl group.
Preparation of the organosiloxane block copolymer of the above formula (I) by polymerizing α,w-bis(oxymethyl)polydimethyl-methylvinylsiloxane, and diphenylmethanediisocyanate, and di(oxyethyl)m-toluidine in the presence of a solvent and a catalyst. A composite membrane, which may be used in a pervaporation process, comprising a hydrophilic asymmetric membrane coated with a mixture of an organosiloxane block copolymer, a linking reagent and a catalytically effective amount of a hydrosilylation catalyst.
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Citations
12 Claims
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1. A composite membrane comprising a hydrophilic asymmetric membrane coated with a mixture of:
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(a) a poly(methylvinyl)siloxane urethane block copolymer having the structural formula (I) depicted below;
##STR31## wherein;
m has a value of 8.0-18.0;n has a value of 1.0-5.0; x has a value of about 0.2 to about 0.7; y has a value of 1 minus the value of x; R is ##STR32## R1 is ##STR33## R2 is a C1 -C5 lower alkylene group;
v is a vinyl group; andMe is a methyl group; (b) a linking reagent; and (c) a catalytically effective amount of a hydrosilylation catalyst. - View Dependent Claims (2, 3, 4)
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- 5. A composite membrane comprising a hydrophilic asymmetric membrane coated with a mixture of (a) an organosiloxane block copolymer having the general formula
- space="preserve" listing-type="equation">--[A--B]--
wherein;
A is an organosiloxane polymer having at least one vinyl group bonded to at least one silicon atom in the organosiloxane polymer and B is an organic polymer block other than an organosiloxane polymer defined as A;
(b) a linking reagent; and
(c) a catalytically effective amount of a hydrosilylation catalyst.- View Dependent Claims (6, 7, 8, 9, 10, 11, 12)
Specification