Visible light absorbing peroxy-esters
AssigneeLoctite Corporation
InventorRobert W. R. Humphreys
Life of this patent
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Abstract
Compounds represented by the formula: ##STR1## wherein R.sup.1 is alkyl, aralkyl, alkoxyalkyl, alkenyl, alkynyl, carboxyalkyl or carboxyaryl; R.sup.2 is any group which does not cause spontaneous decomposition of the peroxy group; and x and y are integers between 0 and 4 with x+y great than or equal to 1, are disclosed. The inventive compounds are useful as visible and UV photoinitiators and as thermal or chemical initiators for curing compositions of ethylenically unsaturated monomers and prepolymers.
Claims24
A peroxy compound having the general formula:
- ##STR3## where R.sup.1 is alkyl, aralkyl, alkoxalkyl, alkenyl, alkynyl or carboxyalkyl;
- R.sup.2 is any group which does not cause spontaneous decomposition of the peroxy group;
- x and y are integers between 0 and 4 and x+y is greater than or equal to 1.
In a free radical curable composition, a cure catalyst comprising a peroxy ester compound as defined by the general formula ##STR4## wherein R.sup.1 is alkyl, aralkyl, alkoxyalkyl, alkenyl, alkynyl or carboxyalkyl
- R.sup.2 is any group which does not cause spontaneous decomposition of the peroxy group;
- x and y are integers between 0 and 4 and x plus y is greater than or equal to 1.
A method of preparing a visible light active photoinitiator comprising reacting an unsubstituted or substituted fluorenone carboxylic or dicarboxylic acid chloride with an organic hydroperoxide.
A method of providing a cured coating on a substrate having shadow areas not accessible by direct radiation, the method comprising applying a coating of a free radical curable composition to the substrate, the curable composition including:
- (a) a peroxy initiator of the general formula ##STR5## where R.sup.1 is alkyl, aralkyl, alkoxyalkyl, alkenyl, alkynyl or carboxalkyl;
- R.sup.2 is any group which does not cause spontaneous decomposition of the peroxy group;
- x and y are integers between 0 and 4 and x plus y is greater than or equal to 1, and
- (b) a peroxide activator,
- exposing the substrate to UV or visible light to rapidly cure the light accessible areas and curing the light inaccessible areas by chemical activation of said peroxy initiator.
A method of curing a free radically polymerizable formulation comprising an olefinically unsaturated compound and a compound of the formula:
- ##STR6## wherein R.sup.1 is alkyl, aralkyl, alkoxyalkyl, alkenyl, alkynyl, carboxyalkyl, or carboxaryl;
- R.sup.2 is any group which does not cause spontaneous decomposition of the peroxy groups;
- x and y are integers between 0 and 4 and x plus y is greater than or equal to 1,
- the method comprising exposing the formulation to visible light for sufficient time to cure the formulation.
Dependencies are inferred from the claim text.