Detail of "3806-34-6"

Reference

Polystyrene compositions

Polystyrene compositions. Hargreaves, Brian; Smith, Brian Howard Alfred (Polysar Ltd., Can.). Ger. Offen. DE 3410406 A1 27 Sep 1984, 34 pp. (German). (Germany). CODEN: GWXXBX. CLASS: IC: C08F112-08; C08F112-12; C08F002-44; C08L025-06; C08J009-00; C08J003-20. APPLICATION: DE 84-3410406 21 Mar 1984. PRIORITY: US 83-478030 23 Mar 1983. DOCUMENT TYPE: Patent CA Section: 37 (Plastics Manufacture and Processing) Polymers with good stability, suitable for foam recycling, are prepd. by thermal polymn., optionally in the presence of radical initiators, of styrene or p-methylstyrene to 365% conversion, with addn. of 0.1-6 phr 1:2-4 mixt. of hindered phenols and polyphosphites at a time at which 33% further conversion occurs. Thus, adding styrene contg. octadecyl 3-(3,5-di-tert-butyl-4-hyudroxyphenyl) propionate [2082-79-3] 0.035, 1,1,3-tris(5-tert-butyl-4-hydroxy-2-methylphenyl)butane (I) [1843-03-4] 0.1, cyclic pentaerythritol bis(octadecylphosphite) (II) [3806-34-6] 0.3, and Zn stearate 0.07 to a cascade of 3 reactors held at 125°, 130°, and 140° gave an 85-92% conversion to polystyrene [9003-53-6] with Brabender Plasticorder torque (230°, 100 rpm) 800 and 700 m-g after 5 and 20 min, resp., and no.-av. mol. wt. 126,300 and 113,700 before and after this treatment, resp., compared with 680 m-g, 325 m-g, 126,700 and 78,140, resp., in the absence of I and II.

Effect of phosphorus-containing stabilizers on molecular characteristics and resistance of 4,4'-oxydianiline-pyromellitic anhydride copolymer polyamic acid to degradation

Effect of phosphorus-containing stabilizers on molecular characteristics and resistance of 4,4'-oxydianiline-pyromellitic anhydride copolymer polyamic acid to degradation. Silinskaya, I. G.; Prokhorova, L. K.; Dergacheva, E. N.; Bel'nikevich, N. G.; Kallistov, O. V.; Sidorovich, A. V. (USSR). Plast. Massy, (7), 44-7 (Russian) 1984. CODEN: PLMSAI. ISSN: 0554-2901. DOCUMENT TYPE: Journal CA Section: 37 (Plastics Manufacture and Processing) The effect of P-contg. heat stabilizer-antioxidants P-1 [3806-34-6] and P-2 [3076-63-9] on the mol. wt. and properties of 4,4'-oxydianiline-pyromellitic dianhydride copolymer (I) [25038-81-7] was studied. The mol. wt. of polyimide increased to 122 ′ 105 with increasing P-1 content of the I polyamic acid to 0.5% and decreased to 33 ′ 103 with increasing P-2 content to 5%. The tensile strength and elongation of I decreased by addn. of P-1 or P-2. The viscosity of the original and stabilized polyamic acid in concd. DMF solns. decreased monotonically with increasing storage time. A correlation was established between the degrdn. resistance of polyamic acids in the presence of P-1 or P-2 and thermal stability of polyimide films prepd. from them.