Low color compositions comprising a cross-linked polycyanurate p

Synthetic resins or natural rubbers -- part of the class 520 ser – Synthetic resins – Mixing of two or more solid polymers; mixing of solid...

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427379, 525452, 525535, 260DIG35, C08L 6900, C08L 6702

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active

044143664

ABSTRACT:
Purified aromatic dicyanates are cured with a catalyst which is an Mn(II), Ag(II), Fe(III), Bi(III), In(III) or Hf(IV) salt at 150.degree.-200.degree. C. and then at 200.degree.-300.degree. C. for a time sufficient to cure the dicyanate without causing color formations to the extent of a Yellowness Index over 30. In some forms the dicyanate is combined with the catalyst and a thermoplastic.

REFERENCES:
patent: 3840578 (1974-10-01), Hennig
patent: 4026913 (1977-05-01), Tanigaichi et al.
patent: 4046796 (1977-09-01), Rotloff et al.
patent: 4157360 (1979-06-01), Prevorsek et al.
V. V. Korshak et al., Vysokomol, Soyed A16, No. 1, pp. 15-23, 1974 (esp. p. 17).
V. V. Korshak et al. pp. 23-27 (esp. p. 29).
V. V. Korshak et al. vol. 202, No. 2, pp. 347-350 (1972).

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