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1. (WO2018085190) POLYTHIOL SEALANT COMPOSITIONS

Pub. No.:    WO/2018/085190    International Application No.:    PCT/US2017/058976
Publication Date: Sat May 12 01:59:59 CEST 2018 International Filing Date: Tue Oct 31 00:59:59 CET 2017
IPC: C09K 3/10
C08L 81/02
C08K 5/00
Applicants: 3M INNOVATIVE PROPERTIES COMPANY
Inventors: TOWNSEND, Erik M.
YE, Sheng
ZOOK, Jonathan D.
SWAN, Michael D.
Title: POLYTHIOL SEALANT COMPOSITIONS
Abstract:
Provided are sealant compositions that include a first component and second component. The first component contains a polysulfide, a polythioether, or a copolymer or combination thereof containing pendant or terminal thiol groups, while the second component contains an ethylenically-unsaturated compound and either the first or second component further contains a photoinitiator. Alternatively, the second component can contain a polyepoxide and either the first or second component can contain a photolatent base and a photosensitizer. The first or second component further contains a colorant that substantially reflects or substantially transmits light over the wavelength range from 350 nm to 500 nm. These compositions can provide cure-on-demand sealant formulations that comply with Class B sealant regulations on color, provide an acceptable depth of cure, and allow two-part mixing to be easily distinguishable.