Abstract: Disclosed are high concentration aqueous dispersions of normally solid organic peroxides using a dispersion agent comprising an alkylaryl polyether alcohol and an oxyalkylated phenolic resin. Optional components such as thickening agents, anionic emulsifiers and a partial ester of a carboxylic acid copolymer may also be included. Dispersions having concentrations of up to about 65% weight percent organic peroxide can be prepared. Dispersions having concentrations of up to about 40 weight percent organic peroxide are sprayable. Also disclosed are the curing of polyester resins and the suspension polymerization of vinyl monomers using these dispersions.

Abstract: A storage stable aqueous dispersion useful in the curing and foaming of unsaturated polyester resins comprising an aromatic diacyl peroxide, an alkali metal carbonate or bicarbonate, dispersion-stabilizing amount of magnesium aluminum silicate and an alkali metal carboxymethyl cellulose, glycerol and water. As an optional component this composition can also contain an anionic dispersing agent. Also disclosed is the preparation of foamed polyester resins using the dispersion.

Abstract: A storage stable aqueous dispersion useful in the curing and foaming of unsaturated polyester resins comprising an aromatic diacyl peroxide, an alkali metal carbonate or bicarbonate, dispersion-stabilizing amount of magnesium aluminum silicate and an alkali metal carboxymethyl cellulose, glycerol and water. As an optional component this composition can also contain an anionic dispersing agent. Also disclosed is the preparation of foamed polyester resins using the dispersion.

Abstract: A storage stable aqueous dispersion useful in the curing and foaming of unsaturated polyester resins containing an aromatic diacyl peroxide, an alkali metal carbonate or bicarbonate and dispersion-stabilizing amounts of magnesium aluminum silicate and an alkali metal carboxymethyl cellulose. Also disclosed is the preparation of foamed polyester resins using the dispersion.

Abstract: A storage stable aqueous dispersion useful in the curing and foaming of unsaturated polyester resins containing an aromatic diacyl peroxide, an alkali metal carbonate or bicarbonate and dispersion-stabilizing amounts of magnesium aluminum silicate and an alkali metal carboxymethyl cellulose. Also disclosed is the preparation of foamed polyester resins using the dispersion.

Abstract: A composition for foaming polyester which includes a carbonate or bicarbonate salt and water intermixed with a finely divided solid free flow agent such as synthetic amorphous silica. The free flow agent is added in an amount sufficient to absorb all of the water and render the composition a free flowing powder. The composition is readily mixable with an unsaturated polyester resin media. A source of acid in the mixture liberates gas from the carbonate or bicarbonate, and good foam structures having small uniform cells are obtained.

Abstract: A composition for foaming polyester which includes a carbonate or bicarbonate salt and water intermixed with a finely divided solid free flow agent such a synthetic amorphous silica. The free flow agent is added in an amount sufficient to absorb all of the water and render the composition a free flowing powder. The composition is readily mixable with an unsaturated polyester resin media. A source of acid in the mixture liberates gas from the carbonate or bicarbonate, and good foam structures having small uniform cells are obtained.

Abstract: Gem-diperoxyesters of the formula: ##STR1## where R is selected from methyl and ethyl; R.sub.1 is ethyl when R is ethyl; R.sub.1 is hydroxyalkyl of 1 to 7 carbon atoms when R is methyl; and each R.sub.2 is ##STR2## where each of R.sub.3, R.sub.4, and R.sub.5 is selected from hydrogen and alkyl, provided not more than one of R.sub.3, R.sub.4, and R.sub.5 is hydrogen, R.sub.3, R.sub.4, and R.sub.5 collectively containing from 2 to 12 carbon atoms.The compounds are particularly efficient at varying temperatures from ambient to 60.degree. C. for the initiation of the polymerization of vinyl chloride. They also have high efficiency in the curing of polyester resins and in the polymerization of other monomers and comonomers having ethylenic unsaturation.

Abstract: Gem-diperoxyesters of the formula: ##STR1## where R is selected from methyl and ethyl; R.sub.1 is ethyl when R is ethyl; R.sub.1 is hydroxyalkyl of 1 to 7 carbon atoms when R is methyl; and each R.sub.2 is ##STR2## where each of R.sub.3, R.sub.4, and R.sub.5 is selected from hydrogen and alkyl, provided not more than one of R.sub.3, R.sub.4, and R.sub.5 is hydrogen, R.sub.3, R.sub.4, and R.sub.5 collectively containing from 2 to 12 carbon atoms.The compounds are particularly efficient at varying temperatures from ambient to 60.degree. C. for the initiation of the polymerization of vinyl chloride. They also have high efficiency in the curing of polyester resins and in the polymerization of other monomers and comonomers having ethylenic unsaturation.

Abstract: High density polyethylene is cross-linked with certain cyclic perketals including a group of novel cyclic perketals. Typical of the novel molecules is 3,6,6,9,9-pentamethyl-3-ethylacetate-1,2,4,5-tetraoxy cyclononane.

Abstract: Novel processes and compositions are provided for the preparation of foamed, crosslinked polyethylene utilizing cyclic peroxyketal crosslinking/blowing agents. The novel compositions include esters of thiodipropionic acid as activators.

Abstract: High density polyethylene is cross-linked with certain cyclic perketals including a group of novel cyclic perketals. Typical of the novel molecules is 3,6,6,9,9-pentamethyl-3-ethylacetate-1,2,4,5-tetraoxy cyclononane.

Abstract: Unsaturated polyester resin foams or cellular structures of varying low densities are prepared quickly at ambient temperatures from an admixture which comprises a liquid unsaturated curable polyester resin, an organic isocyanate compound, a suitable surfactant, an accelerator and a particular combination of peroxide curing agents, which also serves to initiate the release of gases that permit expansion of the resin in a controlled manner to obtain a foamed structure.

Abstract: High density polyethylene is cross-linked with certain cyclic perketals including a group of novel cyclic perketals. Typical of the novel molecules is 3,6,6,9,9-pentamethyl-3-ethylacetate-1,2,4,5-tetraoxy cyclononane.

Abstract: Acyl peroxycarbonic esters of the formula ##STR1## in which R is methyl or ethyl, R' is alkyl, and R and R' together have 17 or more carbon atoms. The compounds have unusual thermal stability, together with improved polymerization initiating efficiency. Particularly outstanding efficiency is found in connection with the curing of polyester resins.

Abstract: Acyl peroxycarbonic esters of the formula ##STR1## in which R is methyl or ethyl, R' is alkyl, and R and R' together have 17 or more carbon atoms. The compounds have unusual thermal stability, together with improved polymerization initiating efficiency. Particularly outstanding efficiency is found in connection with the polymerization of methyl methacrylate.

Abstract: Acyl peroxycarbonic esters of the formula ##STR1## in which R is methyl or ethyl, R' is alkyl, and R and R' together have 17 or more carbon atoms. The compounds have unusual thermal stability, together with improved polymerization initiating efficiency. Particularly outstanding efficiency is found in connection with the vulcanization of silicone rubber.

Abstract: Acyl peroxycarbonic esters of the formula ##STR1## in which R is methyl or ethyl, R' is alkyl, and R and R' together have 17 or more carbon atoms. The compounds have unusual thermal stability, together with improved polymerization initiating efficiency. Particularly outstanding efficiency is found in connection with the polymerization of methyl methacrylate.