Time-lapse free-radical polymerizable composition

Details Time-lapse free-radical polymerizable composition Time-lapse free-radical polymerizable composition

1975-04-02

1977-02-22

Wong, Jr., Harry

Chemistry of carbon compounds

Miscellaneous organic carbon compounds

156327, 428500, 526 48, 526 92, 526135, 526146, 526147, 526303, 526317, 526328, 526330, 526341, 526346, 526348, C08F 2010, C08F12014

Patent

active

040091503

ABSTRACT:
A time-lapse free-radical polymerizable composition which comprises (1) a free-radical polymerizable compound such as an ethylenically unsaturated monomer or a reactive polymer; (2) a soluble polymerization initiator such as a diacyl peroxide, a ketone peroxide; an alkyl peroxy ester, a dialkyl peroxide, or an inorganic persulfate; (3) a soluble, reducible metal chelate such as an iron or copper chelate in which the chelating agent is a .beta.-dicarbonyl compound having an enol content of at least 4 percent and a dicarbonyl angle of not greater than 120.degree., or a .beta.-hydroxy nitrogen-heterocyclic fused aromatic in which the hydroxyl group is attached to a carbon beta to the nitrogen in an adjacent ring; (4) a soluble organic reducing agent which is capable of reducing ferric ions to ferrous ions or cupric ions to cuprous ions; and (5) excess chelating agent in the amount of 10.sup.-.sup.4 to 2.5 moles of excess chelating agent per mole of reducible metal chelate. The length of the time-lapse before onset of polymerization can be controlled by the amount of excess chelating agent present without affecting the rate of polymerization once polymerization is initiated.

REFERENCES:
patent: 2610965 (1952-09-01), Vandenberg
patent: 2612490 (1952-09-01), Gould

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