Synthetic resins or natural rubbers -- part of the class 520 ser – Synthetic resins – From aldehyde or derivative thereof as reactant
Patent
1979-05-03
1981-08-18
Anderson, Harold D.
Synthetic resins or natural rubbers -- part of the class 520 ser
Synthetic resins
From aldehyde or derivative thereof as reactant
260 173, 260 37NP, 260 39P, 260 294R, 525509, 528240, 528242, 528244, 528259, 528265, 528502, 162146, 162166, C08G 1212
Patent
active
042847591
ABSTRACT:
Aminoplast resin pigments for paper making comprise large surface area (>5m.sup.2 /g) particles, preferably of size below 200 .mu.m, made from an aminoplast resin made by condensing formaldehyde with urea and/or melamine in the presence of 0.2 to 15 moles, per 100 moles of formaldehyde, or sulphite, phosphate, phosphite or borate radicals. The resin may be converted to the particulate form by gelling the resin in extended form by dilution with an aqueous acid, followed by drying, curing, and comminution of the gelled resin. To effect gelation in extended form the resin is preferably diluted to a resin solids content of less than 25% by weight by the addition of sufficient acid to cause gelation within 20 minutes.
REFERENCES:
patent: 2556898 (1951-06-01), Brookes et al.
patent: 2863842 (1958-12-01), Bonzagni
patent: 3909348 (1975-09-01), Economou et al.
patent: 3928272 (1975-12-01), Brancato et al.
patent: 3941734 (1976-03-01), Aignesberger et al.
patent: 3983269 (1976-09-01), Pearson
patent: 4172057 (1979-10-01), Henbest
Chemical Abstracts, 83, 80292y (1975).
Harrison John
Henbest Richard G. C.
Anderson Harold D.
Imperial Chemical Industries Limited
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