Reference

Poly(oxymethylene) molding compositions

Poly(oxymethylene) molding compositions. Amann, Herbert; Morlock, Gerhard (Deutsche Gold- und Silber-Scheideanstalt vorm. Roessler, Ger.). Ger. DE 2540207 18 Nov 1976, 9 pp. (German). (Germany). CODEN: GWXXAW. CLASS: IC: C08L059-02. APPLICATION: DE 75-2540207 10 Sep 1975. DOCUMENT TYPE: Patent CA Section: 36 (Plastics Manufacture and Processing) The addn. of a finely divided, crosslinked, water-insol. HCHO-melamine copolymer (I) [9003-08-1] to a polyoxymethylene contg. a phenolic antioxidant improved the heat stability of the polyoxymethylene. Thus, 4 g I, prepd. from 4 mol HCHO and 1 mol melamine in an aq. dispersion, was mixed with 1 kg 1,3-dioxepane-trioxane copolymer [61910-70-1], 4 g hexanediyl bis[3-(3,5-di-tert-butyl-4-hydroxyphenyl)propionate] [35074-77-2], and 6 mL 0.1% aq. 61910-70-1 and 23128-74-7 are cas registry numbers of chemicals which are used as reagents here. Na2CO3 soln. and extruded to prep. a molding which lost 6.3% of its wt. during 2 h at 220.degree. in air, compared with 7.1% for a mixt. contg. no I. .

Substance migration from plastics food packaging to contents as a function of the ratio of solvent volume to sample surface area

Substance migration from plastics food packaging to contents as a function of the ratio of solvent volume to sample surface area. Leimgruber, R. A.; Figge, K. (Ciba-Geigy Ltd., Basel, Switz.). Saf. Health Plast., Natl. Tech. Conf., Soc. Plast. Eng., 40-3. SPE: Greenwich, Conn. (English) 1977. CODEN: 37AYAS. DOCUMENT TYPE: Conference CA Section: 17 (Foods) Section cross-reference(s): 37 By using migration cells made of 11 ′ 10-cm glass plates with filter paper or Teflon membrane satd. with fat simulant HB 307 alternating with pressed plastic film 5-10 layers thick sandwiched between the plates, up to 1 dm2 of film surface was brought into contact with the fat and the ratio of surface area to fat vol. could be made as high as . With pressed plaques of polyacetal, stabilized with 10% Irganox 259 [35074-77-2] and this app., 94 and 186 ppm was found in fat in filter paper and Teflon, resp., after 10 d at 40° and 65% relative humidity, amts. 59- and 259-fold greater than were obtained by using conventional techniques (FDA Guidelines for Chem. and Technol., 1976).