Patent · US Expired

Powdery copolymer comprising methyl methacrylate and monomer having a basic nitrogen atom

US4071653A · kind A · utility

18Cited by

3References

9Claims

0Family size

Assignee

Rohm Co., Ltd. · JP

Inventors

Hanns Boessler · Darmstadt, DE
Peter Quis · Darmstadt, DE
Joachim Buechse · Trebur, DE
Hubert Rauch · Weiterstadt, DE

Key dates

Filing date	Sep 27, 1976
Grant date	Jan 31, 1978
Priority date	—
Expiry date	Sep 27, 1996

Classification

Technology area (CPC Y)Emerging Cross-Sectional Technologies
CPC primaryY10T428/31935
WIPO fieldMacromolecular chemistry, polymers
WIPO sectorChemistry

Abstract

A powdery copolymer having a powder particle size from 0.1 to 200 microns, said copolymer comprising at least 50 percent by weight of methyl methacrylate and 0.2 to 10 percent by weight of at least one monomer having a basic nitrogen atom, the balance, if any, being other monomers copolymerizable therewith, said copolymer being prepared by emulsion copolymerization such that all or a predominant portion of the monomer or monomers having a basic nitrogen atom is first added to the remaining monomers after the polymerization of at least half of said remaining monomers, the resulting copolymer then being recovered from the resultant latex in powder form.

Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.