Color-stabilized phenolic foams

Details Color-stabilized phenolic foams Color-stabilized phenolic foams

1982-01-25

1983-01-18

Foelak, Morton

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

Synthetic resins

Cellular products or processes of preparing a cellular...

521 85, 521132, 521181, 524414, C08J 900

Patent

active

043692591

ABSTRACT:
The present invention relates to foams made of resol-type phenolic resins which do not discolor as quickly as prior-art phenolic foams. With the additive in accordance with the invention, even colored foams will not darken as readily. The foams in accordance with the invention contain as stabilizers salts of phosphinic acid or phosphonic acid, such as the primary alkali phosphites or the alkali phosphinates. The stabilizers, which protect the foams against the action of light and/or air and/or heat, are used in amounts ranging from 0.1 to 5 weight percent. The present invention further relates to methods of preparing such foams. In a preferred method, the stabilizers are admixed with an expandable resol-type phenolic resin, the mixture so obtained is mixed with the other substances necessary to formation of a foam, and the whole mixture is then foamed conventionally.

REFERENCES:
patent: 2186687 (1940-01-01), Thompson et al.
patent: 3383338 (1968-05-01), Wells et al.
patent: 3409571 (1968-11-01), Shepard et al.
patent: 3541046 (1970-11-01), Kerst
patent: 3673130 (1972-06-01), Papa et al.

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