Hydrophilic polysiloxane compositions containing carbinol groups
OwnerRamani Narayan, Daniel Graiver +1inventors
InventorsRamani Narayan, Daniel Graiver, Sudhanwa Dewasthale
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Abstract
Preparation and use of organopolysiloxanes having carbinol groups that are bonded to the silicon atom through carbamate-containing groups. These hydrophilic polysiloxanes can be made to completely dissolve in water or behave as amphoteric surfactants by controlling the concentration of the carbinol radicals and the molecular weight of the polysiloxane.
Claims10
Carbinol-functional siloxane copolymers having the general formula:
- where x and y are integers equal or greater than zero, R1 is a monovalent hydrocarbon alkyl radical selected from the group consisting of methyl, ethyl, and propyl, aryl radicals selected from the group consisting of phenyl, tolyl, and xylyl, and aralkyl radicals selected from the group consisting of benzyl and phenethyl, where the group ROH is a carbinol radical having the general formula:
- where R and R* are monovalent hydrocarbon alkylene radicals selected from the group consisting of ethylene, propylene, butylene, isobutylene, and methylpropylene,
- R′ is selected from R1 or ROH and if both x and y are zero than R′ can only be equal to ROH.
A process for making a hydrophilic polysiloxane containing pendant carbinol functional groups having the general formula:
- said method comprising reacting substantially equimolar quantities of pendant aminosilanes with cyclic carbonate.
A process for making a hydrophilic polysiloxane containing pendant carbinol functional groups having the general formula:
- said method comprising:
- A. heating a mixture of silanol terminated dimethylsiloxane oligomers, an aminosilane, and a siloxane endblocker, in the presence of a catalyst;
- B. heating the mixture of A. for a predetermined period of time at a temperature no greater than 150° C.;
- C. reducing any pressure incurred to promote condensation;
- D. removing any water and any alcohol by-products from the reaction mixture
- E. reacting the amino-functional polysiloxane from D. in a melted condition with cyclic carbonate at less than 100° C. to produce the desired carbinol-functional polysiloxane.
A process for making hydrophilic polysiloxane containing terminal carbinol functional groups having the general formula:
- by reacting substantially equimolar quantities of terminal aminosilanes with cyclic carbonate.
A process for making a hydrophilic polysiloxane containing terminal carbinol functional groups having the general formula:
- said method comprising:
- A. heating a mixture of silanol terminated dimethylsiloxane oligomers, an aminosilane, and a siloxane endblocker, in the presence of a catalyst;
- B. heating the mixture of A. for a predetermined period of time at a temperature no greater than 150° C.;
- C. reducing any pressure incurred to promote condensation;
- D. removing any water and any alcohol by-products from the reaction mixture;
- E. reacting the amino-functional polysiloxane from D, in a melted condition with cyclic carbonate at less than 100° C. to produce the desired carbinol-functional polysiloxane.
A process for making hydrophilic polysiloxane containing copolymers containing both terminal and pendant
- groups,
- said method comprising;
- A. heating a mixture of silanol terminated dimethylsiloxane oligomers and dimethylsiloxane oligomers containing pendant silanol groups, an aminosilane, and a siloxane endblocker, in the presence of a catalyst;
- B. heating the mixture of A. for a predetermined period of time at a temperature no greater than 85° C.;
- C. reducing any pressure incurred to promote condensation;
- D. removing any water and any alcohol by-products from the reaction mixture;
- reacting the amino-functional polysiloxane from D. in a melted condition with cyclic carbonate at less than 100° C. to produce the desired carbinol-functional polysiloxane.
Dependencies are inferred from the claim text.