Pennwalt Corporation

Elf Atochem North America, Inc.

Harold Carl Lange

Ronald E MacLeay

Ernest R Kamens

Donald Milton Kressin

Chester Stephen Sheppard

N-(2,2,6,6-tetraalkyl-4-piperidinyl)amic acid hydrazides contain a light stabilizing group, a heat stabilizing group and an amic acid hydrazide functionality in the same molecule. The amic acid hydrazide functionality in the compounds enhances the photooxidative stabilizing properties of the hindered amine groups and contributes thermal and oxidative stabilizing and metal complexing properties to the compounds. The novel compounds are excellent light stabilizers for polyolefins, have low volatility and are not readily lost from polymeric systems via volatilization, migration or extraction.

Derivatives of N-hals-substituted amic acid hydrazides

Derivatives of N-HALS-substituted amic acid hydrazides

Cellular polymeric solids are made by mixing an acidulous or acidic polymerizable medium that is polymerizable and/or cross-linkable by a free radical mechanism (e.g. an unsaturated polyester) with an effective amount of two or more acid sensitive mono- or poly-azo compounds containing the group: ##STR1## wherein Y is an acid sensitive group (e.g. Cl, OH, --OCN, --NCO) which in the presence of an acidulous or acidic polymerizable medium causes sufficient decompsition of the azo compound that gas is released in the medium and during the decomposition the mono- or poly- azo compound promotes polymerization and/or cross-linking of the medium to provide a matrix that is sufficiently polymerized and/or cross-linked that the generated gases cause the matrix to expand, each of the remaining valences being satisfied by an organic radical; provided that any carbon atom that is directly linked to an azo nitrogen, except that of a carbonyl group, has at least two of its remaining three valences satisfied by a carbon to carbon bond or a carbon to hydrogen bond. Preferably, the mixture contains at least two such azo compounds having appreciably different sensitivity to decomposition by acid. The process is especially useful in making foamed flotation structures (e.g. boat hulls).

Process for preparing foamed solids using two or more azo compounds

Tertiary-aliphatic alpha-peroxyazo compounds represented by the structure ##STR1## processes for preparing these compounds by reacting ##STR2## with salts or salt solutions of

Tertiary aliphatic alpha-peroxyazo compounds

Shaped cellular structures formed from media which are polymerizable and/or cross-linkable by free radical initiation to either a thermoplastic or thermosetting solid, process for production of such structures and the composition therefor. Process comprises preparation of composition by mixing an acid sensitive azo compound with an acidulous or acidic polymerizable medium, after which the composition is permitted to foam into a cellular structure of the desired shape. Acid sensitive azo compounds are those mono- and poly- azo compounds containing the group ##STR1## wherein Y is monovalent or divalent acid sensitive group which in the presence of an acidulous or acidic polymerizable medium causes sufficient decomposition of the azo compound that gas is released in the medium and during said decomposition said mono- or poly- azo compounds promote polymerization and/or crosslinking to provide a matrix that is sufficiently polymerized and/or crosslinked that the generated gases cause the matrix to expand, the remaining valences in the group being satisfied by organic radicals; provided that any carbon atom that is directly linked to an azo nitrogen (except that of a carbonyl group) has at least two of its remaining three valences satisfied by a carbon to carbon bond or a carbon to hydrogen bond.

Polymeric cellular structures

Azoalkanes of the formula ##STR1## WHERE Z is isocyanate or isothiocyanate or derivatives thereof, such as 1-t-butylazo-1-isothiocyanatocyclohexane, which are useful as foaming agents for polyester resins and as free radical initiators for vinyl monomers.

.alpha.-ISOCYANATO AND .alpha.-ISOTHIOCYANATO AZOS AND THEIR DERIVATIVES

Shaped cellular structures formed from media which are polmerizable and/or cross-linkable by free radical initiation to either a thermoplastic or thermosetting solid, process for production of such structures and the composition therefor. Process comprises preparation of composition by mixing an acid sensitive azo compound with an acidulous or acidic polymerizable medium, after which the composition is permitted to foam into a cellular structure of the desired shape. Acid sensitive azo compounds are those mono- and poly- azo compounds containing the group ##EQU1## wherein Y is monovalent or divalent acid sensitive group which in the presence of an acidulous or acidic polymerizable medium causes sufficient decomposition of the azo compound that gas is released in the medium and during said decomposition said mono- or poly- azo compounds promote polymerization and/or crosslinking to provide a matrix that is sufficiently polymerized and/or crosslinked that the generated gases cause the matrix to expand, the remaining valences in the group being satisfied by organic radicals; provided that any carbon atom that is directly linked to an azo nitrogen (except that of a carbonyl group) has at least two of its remaining three valences satisfied by a carbon to carbon bond or a carbon to hydrogen bond.

Growing community of inventors

Grand Island, NY, United States of America

Harold Carl Lange