High yield synthesis of hydroxyl-containing cationic photoinitia

Details High yield synthesis of hydroxyl-containing cationic photoinitia High yield synthesis of hydroxyl-containing cationic photoinitia

1990-08-30

1991-12-17

Prescott, Arthur C.

Organic compounds -- part of the class 532-570 series

Organic compounds

Heavy metal containing

427 541, 522 15, 522 25, 568 6, 568 16, 568 17, 568 28, 570123, 570130, C07F 502, C07F 990, C07F 992, C07F 900

Patent

active

050736434

ABSTRACT:
Synthesis use of a new class of diaryliodonium salt photo and thermal polymerization initiators in which the aryl groups are substituted with alkoxy group bearing hydroxy groups. Good to excellent yields are obtained of diaryliodonium salts in which the aryl groups are substituted with long chain alkoxy groups, which alkoxy groups also possess at least one hydroxyl moiety attached at the 2-position of an alkoxy group. The resultant salts have enhanced solubility when compared with their lower molecular weight counterparts. The hydroxyl groups serve as chain transfer agents; and, in cross linking UV-induced cationic polymerizations, the hydroxyl groups effect marked accelertion on polymerization rates. The salts also have excellent compatability with nonpolar monomers such as epoxidized oil and poly(1,2-butadience oxide) and provide further benefits when they are used along with copper cocatalysts in thermally curable polymer systems. In the latter form of cases, the secondary hydroxyl group serves as a reducing agent for the copper (II) complex.

REFERENCES:
patent: 4090936 (1978-05-01), Barton
patent: 4329300 (1982-05-01), Crivello et al.
patent: 4450360 (1984-05-01), Crivello et al.
patent: 4683317 (1987-07-01), Crivello
patent: 4882201 (1989-11-01), Crivello
Crivello, Conlon, Olson & Webb; "The Effects of Polyols As Chain Transfer Agents and Flexibilizers in Photo initiated Cationic Polymerization"; J. of Rad. Curing; Oct. '86, pp. 3-5.

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