Application of precipitates of methylene ureas and products obta

Stock material or miscellaneous articles – Composite – Of polyamide

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106148, 106214, 106288Q, 162166, 162168N, 260 6, 260 173, 260 69R, 260851, 428511, 428530, 428535, B32B 902, B32B 904, D21H 128

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039595706

ABSTRACT:
A method of manufacture from a predetermined material, especially from a natural fibrous material and/or synthetic fibrous material of an article, in particular a sheet for printing or reproduction, which combines superior qualities of brightness, opacity, thermal stability, insolubility and lightness, said method consisting of laoding said material throughout its mass or superficially, with a filler product having a base of a methylene urea precipitate with a low degree of polymerization, obtained by the reaction of urea on formaldehyde in an acid medium.

REFERENCES:
patent: 2399489 (1946-04-01), Landes
patent: 2652374 (1953-09-01), Thompson
patent: 2851424 (1958-09-01), Switzer et al.
patent: 2956898 (1960-10-01), Fleck
patent: 3018287 (1962-01-01), Fleck
patent: 3181950 (1965-05-01), Koerher et al.

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