US 10,118,978 B2 · Vinyl alcohol polymer and production method thereof, additive for drilling mud, drilling mud, additive for drilling cement slurry, and drilling cement slurry

Abstract

Provided by the present invention is a vinyl alcohol polymer crosslinked by a structure represented by the following formula (1) and/or a disulfide structure, in which the vinyl alcohol polymer is not completely dissolved in a mixture prepared by: adding the vinyl alcohol polymer to water so as to give a concentration of 4% by mass; and stirring at 95° C. for 3 hrs. in the formula (1), R1, R2 and R3 each independently represent a hydrogen atom or a substituted or unsubstituted hydrocarbon group having 8 or less carbon atoms. Also provided include an additive for a drilling mud containing the vinyl alcohol polymer, a drilling mud containing the vinyl alcohol polymer as an additive, an additive for a drilling cement slurry containing the vinyl alcohol polymer, and a drilling cement slurry containing the vinyl alcohol polymer as an additive.

Claims12

Dependent claims

A vinyl alcohol polymer comprising molecular main chains crosslinked therebetween by a structure represented by formula (1), wherein the vinyl alcohol polymer is not completely dissolved in a mixture prepared by:

adding the vinyl alcohol polymer to water so as to give a concentration of 4% by mass;
and stirring at 95° C. for 3 hrs,
wherein R1, R2, and R3 each independently represent a hydrogen atom or a substituted or unsubstituted hydrocarbon group having 8 or less carbon atoms.

Dependencies are inferred from the claim text.

Facts

Application

15/021,872Filed 11 Sep 2014

Priority

JP 2013-19047513 Sep 2013

Published

US 2016/0229936 A111 Aug 2016

Granted

6 Nov 2018

Term ends

Not estimatedThe source records don’t support an estimate.

Classification20 codes

C08F 216/06
Acyclic compounds: polyvinyl alcohol ; Vinyl alcohol
C04B 24/16
Use of organic materials as active ingredients for mortars, concrete or artificial stone, e.g. plasticisers: sulfur-containing compounds
C04B 24/2623
Obtained by reactions only involving carbon-to-carbon unsaturated bonds: polyvinylalcohols; Polyvinylacetates
C04B 28/02
Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic…

Vinyl alcohol polymer and production method thereof, additive for drilling mud, drilling mud, additive for drilling cement slurry, and drilling cement slurry

Life of this patent

Vinyl alcohol polymer and production method thereof, additive for drilling mud, drilling mud, additive for drilling cement slurry, and drilling cement slurry

Life of this patent

Abstract

Claims12