Reference

Formaldehyde-poor urea-formaldehyde resin foam

Formaldehyde-poor urea-formaldehyde resin foam. Baumann, Heinz; Baumann, Rembert (Schaum-Chemie W. Bauer G.m.b.H. und Co. K.-G., Fed. Rep. Ger.Chemicals with cas numbers 27176-87-0 and 27043-35-2 also play role.). Ger. Offen. DE 3216897 C1 3 Nov 1983, 6 pp. (German). (Germany). CODEN: GWXXBX. CLASS: IC: C08L061-24; C08J009-28. APPLICATION: DE 82-3216897 6 May 1982. DOCUMENT TYPE: Patent CA Section: 37 (Plastics Manufacture and Processing) A 10-30% aq. ext. of an alkane-, arene-, or alkylarenesulfonic acid is mixed with ￡96% urea [57-13-6] and this soln. with mixed with an aq. hardener-foaming agent soln. contg. a Na salt of an alkane-, arene-, or alkylarenesulfonic acid to give a stable soln. This soln. is used for the foaming of HCHO-urea resin (I) [9011-05-6] precondensates, giving foams having low HCHO content. The I precondensates contain a polyethylene glycol [25322-68-3], such as diethylene glycol (II) [111-46-6], which inhibits foam shrinkage (without affecting fire resistance) and a polyhydric alc. contg. 34 OH which lowers the HCHO content of the foam. Thus, 960 g urea was dissolved in 1 L 20% aq. dodecylbenzenesulfonate acid [27176-87-0] ext. This soln. (200 mL) was added to 800 mL of soln. prepd. by dilg. 45 mL of a mixt. of Na diisobutylnaphthalenesulfonate [27213-90-7] 20, resorcinol [108-46-3] 4, 85% H3PO4 25, and H2O 51% to 1 L with water. The urea remained dissolved in this hardener-foaming agent soln. The soln. (1.7 parts) was used for foaming of 2 parts 40% aq. I precondensate (prepd. with 1.2 mol HCHO/mol urea, pH 7.0) soln. contg. sorbitol [50-70-4] and II. After 11 days, the cured foam contained 0.5 ppm HCHO. .

Some scientific and legal aspects of percutaneous toxicity

Some scientific and legal aspects of percutaneous toxicity. Examples of hair dyes. Maibach, H. I. (Med. 119-34-6 and 2784-94-3 are cas registry numbers. These chemicals are also mentioned in this article. Sch., Univ. California, San Francisco, CA, USA). Labo-Pharma - Probl. Tech., 335, 727-9 (French) 1983. CODEN: LPPTAK. ISSN: 0458-5747. DOCUMENT TYPE: Journal CA Section: 62 (Essential Oils and Cosmetics) Section cross-reference(s): 1, 63 The pharmacokinetics of hair dye components was investigated in humans and animals to assess the degree of uptake and their toxicity. p-Phenylenediamine [106-50-3], resorcinol [108-46-3], 4-amino-2-hydroxytoluene [2835-95-2], 2-nitro-p-phenylenediamine [5307-14-2], 2-nitro-4-aminophenol [119-34-6] and HC blue N. 1 [2784-94-3] were absorbed very slightly under normal conditions and the absorption was lower when applied to the scalp than to clean shaven skin due to a strong fixation of the dyes by the hair. The results were somewhat similar in humans, rhesus monkeys and guinea pigs. .