Polymer scale preventive agent, polymerization vessel for preventing polymer scale deposition, and process of producing polymer using said vessel
First Claim
1. A process of producing a polymer by polymerization of a monomer having an ethylenically unsaturated double bond in a polymerization vessel, comprising the step of carrying out said polymerization in a polymerization vessel having on its inner wall surfaces a coating for preventing polymer scale deposition, wherein the coating comprises:
- a solution or dispersion of(A) an N-substituted leucophenothiazine having the formula (I);
##STR9## wherein Z is a carbonyl group or a sulfonyl group, R1 and R2 may be the same or different and each represent a hydrogen atom, a hydroxyl group or a group having the formula --N(R4) (R5) where R4 and R5 may be the same or different and each represent a hydrogen atom, an alkyl group or a formyl group, and R3 is a hydrogen atom, halogen atom, alkyl group, haloalkyl group, alkoxy group, aryl group or a group having the formula;
--N(R6) (R7) where R6 may be the same or different and each represent a hydrogen atom or an alkyl group, and(B) a water-soluble basic polysaccharide which is a chitosan, water-soluble chitosan derivative, polygalactosamine, water-soluble polygalactosamine derivative or water-soluble chitin,in a solvent.
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Abstract
A polymer scale preventive agent for use in polymerization of a monomer having an ethylenically unsaturated double bond, comprising (A) a N-substituted leucophenothiazine having the general formula (I): ##STR1## wherein Z is a carbonyl group or a sulfonyl group, R1, R2 and R3 are a hydrogen atom, alkyl group, an amino group, etc., and (B) a water-soluble basic polysaccharide. The agent is used for forming a coating on the inner wall, etc. of a polymerization vessel. Deposition of polymer scale can be effectively prevented, and polymeric product with high whiteness is obtained.
37 Citations
3 Claims
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1. A process of producing a polymer by polymerization of a monomer having an ethylenically unsaturated double bond in a polymerization vessel, comprising the step of carrying out said polymerization in a polymerization vessel having on its inner wall surfaces a coating for preventing polymer scale deposition, wherein the coating comprises:
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a solution or dispersion of (A) an N-substituted leucophenothiazine having the formula (I);
##STR9## wherein Z is a carbonyl group or a sulfonyl group, R1 and R2 may be the same or different and each represent a hydrogen atom, a hydroxyl group or a group having the formula --N(R4) (R5) where R4 and R5 may be the same or different and each represent a hydrogen atom, an alkyl group or a formyl group, and R3 is a hydrogen atom, halogen atom, alkyl group, haloalkyl group, alkoxy group, aryl group or a group having the formula;
--N(R6) (R7) where R6 may be the same or different and each represent a hydrogen atom or an alkyl group, and(B) a water-soluble basic polysaccharide which is a chitosan, water-soluble chitosan derivative, polygalactosamine, water-soluble polygalactosamine derivative or water-soluble chitin, in a solvent. - View Dependent Claims (2, 3)
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Specification
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- Resources
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Current AssigneeShin-Etsu Chemical Company Limited
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Original AssigneeShin-Etsu Chemical Company Limited
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InventorsShigemitsu, Minoru, Shimizu, Toshihide
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Primary Examiner(s)Schofer, Joseph L.
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Assistant Examiner(s)WEBER, THOMAS
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Application NumberUS08/207,107Time in Patent Office301 DaysField of Search526/62, 526/205, 526/200US Class Current526/62CPC Class CodesC08F 2/004 by a prior coating on the r...
