Polyalkylene glycol-polyglyoxylate block copolymer, its production process and use
AssigneeNippon Shokubai Co., Ltd.
InventorsTakuya Saeki, Hideyuki Nishibayashi, Tsuyoshi Hirata, Shigeru Yamaguchi
Life of this patent
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Abstract
A new block copolymer, which is excellent with regard to abilities such as dispersibility, chelatability, and scale inhibitability, includes a polyalkylene glycol structural unit and a polyglyoxylate structural unit. This block copolymer, for example, can be produced by carrying out a polymerization reaction between a polyalkylene glycol and a glyoxylic acid-based monomer in the presence of a catalyst in a polymerization reaction system having a water content of about 30 mol % or less relative to the polyalkylene glycol, and used as a cement dispersant, pigment dispersant, water-treating agent, or detergent builder.
Claims21
A block copolymer which comprises:
- a polyalkylene glycol structural unit of the following general formula (1):
- ##STR10## wherein n is an integer of 2 to 4;
- and x is a number of 6 or more on average;
- and
- a polyglyoxylate structural unit of the following general formula (2):
- ##STR11## wherein:
- M is selected from the group consisting of a hydrogen atom, alkyls with 1 to 4 carbon atoms, metal atoms of 1 to 3 in valency, ammonium groups, and organic amine groups;
- and y is a number of about 10 or more on average.
A process for producing a block copolymer, which comprises the step of carrying out a polymerization reaction between:
- a polyalkylene glycol of the following general formula (5):
- ##STR15## wherein:
- R.sup.1 is selected from the group consisting of a hydrogen atom, alkyls, alkenyls, alkylphenyls, phenyl, and benzyl;
- n is an integer of 2 to 4;
- and x is a number of about 5 or more on average;
- and
- a glyoxylic acid-based monomer of the following general formula (6):
- ##STR16## wherein R.sup.2 is an alkyl with 1 to 4 carbon atoms;
- in the presence of a catalyst in a polymerization reaction system which has a water content of about 30 mol % or less relative to the polyalkylene glycol.
A block copolymer which comprises:
- a polyalkylene glycol structural unit of the following general formula (1):
- ##STR17## wherein:
- n is an integer of 2 to 4;
- and x is a number of about 5 or more on average;
- and
- a polyglyoxylate structural unit of the following general formula (2):
- ##STR18## wherein:
- M is selected from the group consisting of a hydrogen atom, alkyls with 1 to 4 carbon atoms, metal atoms of 1 to 3 in valency, ammonium groups, and organic amine groups;
- and y is a number of about 10 or more on average;
- and
- wherein one of the structural units is designated A and wherein the other structural unit is designated B and wherein the block copolymer is an AB block copolymer.
A block copolymer which comprises:
- a polyalkylene glycol structural unit of the following general formula (1):
- ##STR19## wherein:
- n is an integer of 2 to 4;
- and x is a number of about 5 or more on average;
- and
- a polyglyoxylate structural unit of the following general formula (2):
- ##STR20## wherein:
- M is selected from the group consisting of a hydrogen atom, alkyls with 1 to 4 carbon atoms, metal atoms of 1 to 3 in valency, ammonium groups, and organic amine groups;
- and y is a number of about 10 or more on average;
- and
- wherein one of the structural units is designated A and wherein the other structural unit is designated B and wherein the block copolymer is a copolymer having at least one AB block, at least one ABA block, and at least one BAB block.
Dependencies are inferred from the claim text.