A platform for research: civil engineering, architecture and urbanism
A platform for research: civil engineering, architecture and urbanism
A vinyl alcohol-based polymer useful as an additive for oil well cement is provided. The vinyl alcohol-based polymer is produced by saponification of a homopolymer of a vinyl ester monomer or a copolymer of a vinyl ester monomer and a polyfunctional monomer, wherein the vinyl alcohol-based polymer has a difference between transmittance (A) of 1 mass % aqueous solution at 660 nm and transmittance (B) of 1 mass % aqueous solution at 430 nm, i.e. (A-B), of 5 to 25. It is preferable that 1 mass % aqueous solution of the vinyl alcohol-based polymer have a transmittance of 95% or less in an entire wavelength region of 200 nm to 800 nm, and the vinyl alcohol-based polymer have a yellow index of 10 or less.
A vinyl alcohol-based polymer useful as an additive for oil well cement is provided. The vinyl alcohol-based polymer is produced by saponification of a homopolymer of a vinyl ester monomer or a copolymer of a vinyl ester monomer and a polyfunctional monomer, wherein the vinyl alcohol-based polymer has a difference between transmittance (A) of 1 mass % aqueous solution at 660 nm and transmittance (B) of 1 mass % aqueous solution at 430 nm, i.e. (A-B), of 5 to 25. It is preferable that 1 mass % aqueous solution of the vinyl alcohol-based polymer have a transmittance of 95% or less in an entire wavelength region of 200 nm to 800 nm, and the vinyl alcohol-based polymer have a yellow index of 10 or less.
VINYL ALCOHOL-BASED POLYMER
YAMASHITA AKIHIRO (author)
2023-10-05
Patent
Electronic Resource
English
| European Patent Office | 2024