Patent · US Expired

Melamine resins: process for their manufacture and the compression moulding compositions produced from the melamine resins

US4303561A · kind A · utility

7Cited by

2References

8Claims

0Family size

Assignee

Cassella Aktiengesellschaft · DE

Inventors

Steffen Piesch · Oberursel, DE
Alfons Wolf · Seligenstadt, DE

Key dates

Filing date	May 29, 1979
Grant date	Dec 1, 1981
Priority date	—
Expiry date	May 29, 1999

Classification

Technology area (CPC C)Chemistry; Metallurgy
CPC primaryC08L61/32
WIPO fieldMacromolecular chemistry, polymers
WIPO sectorChemistry

Abstract

Partially etherified melamine-formaldehyde resins having a melamine: formaldehyde molar ratio of 1:(1.25 to 1) can be prepared by a condensation reaction under neutral or weakly alkaline conditions if the condensation reaction is carried out in the presence of a glycol monoether of the general formula I EQU R (OCH.sub.2 CH.sub.2).sub.n OH (I) wherein R denotes alkyl having 1 to 4 C atoms and n denotes a number from 1 to 5. The partially etherified melamine-formaldehyde resins are suitable for the production of compression moulding compositions having a high flow and minimal processing shrinkage and after-shrinkage.

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