Modifying agents for thermosetting resins and thermosetting resi

Details Modifying agents for thermosetting resins and thermosetting resi Modifying agents for thermosetting resins and thermosetting resi

1993-06-11

1994-09-13

Kight, III, John

Synthetic resins or natural rubbers -- part of the class 520 ser

Synthetic resins

Processes of preparing a desired or intentional composition...

524 49, 524 50, 527305, 527309, 527312, C08G 1240, C08G 1234

Patent

active

053469372

ABSTRACT:
The present invention relates to modifying agents for melamine-formaldehyde resins and highly reactive thermosetting resins which are prepared with this agent and consist of 1 mol of melamine, 1.5 to 3.5 mol of formaldehyde, 0.5 to 5% by weight of a polyhydric alcohol, based on the melamine plus formaldehyde, and 0.5 to 10% by weight of the modifying agent, based on the liquid resin. The modifying agent can be added to the melamine-formaldehyde resin as a pulverulent mixture before or during the condensation reaction or in the liquid state in the form of a condensation product prepared in a known manner. The modifying agent consists of 10 to 75% by weight of dicyandiamide, 5 to 70% by weight of cold water-soluble starch (soluble between about 18.degree. and about 25.degree. C.) and 20 to 85% by weight of a guanamine. The highly reactive resins modified in this way are preferably used for coating chipboard and hardboard by a short cycle process.

REFERENCES:
patent: 2197357 (1940-04-01), Widmer et al.
patent: 5055541 (1991-10-01), Floyd et al.

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