Matrices and sealants which are based on sulfur-containing polymers and which comprise a photoinitiator, curing and coating methods, and use of said matrices and sealants

US11124674B2 · kind B2 · utility

Assignee

• CHEMETALL GMBH · DE

Inventors

• Miroslav Kralev · Frankfurt am Main, DE
• Björn Sievers · Frankfurt am Main, DE
• Peter Bons · Reichelsheim, DE
• Francisco Diez · Mörfelden, DE

Key dates

• Filing date: Jun 19, 2019
• Grant date: Sep 21, 2021
• Expiry date: Jul 29, 2039

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C09D181/00
• WIPO field: Macromolecular chemistry, polymers
• WIPO sector: Chemistry

Abstract

A method for curing a mixture of a matrix and a curing agent based on sulfur-containing polymers on command and so rapidly that a tack-free surface results. A method for coating a substrate with the composition and of curing a sealant is also provided. The matrix and curing agent containing sulfur-containing polymers. The mixture is an uncured mixture with an isocyanate content, and the matrix is uncured and contains a mercaptan-terminated base polymer based on at least one polyether, polythioether, polysulfide or copolymers thereof. The uncured matrix, the curing agent, or both contain at least one photoinitiator based on sterically-inhibited tertiary amines. The mixture cures in the temperature range of −10 to +70° C. after the high-energy actinic radiation is applied. Corresponding matrices A, mixtures B, curing agents, sealant systems, and substrates, e.g., aircraft are contemplated.