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

US4328326A · kind A · utility

Assignee

• Cassella Aktiengesellschaft · DE

Inventors

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

Key dates

• Filing date: Jan 9, 1981
• Grant date: May 4, 1982
• Expiry date: Jan 9, 2001

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C08L61/32
• WIPO field: Macromolecular chemistry, polymers
• WIPO sector: Chemistry

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.