POLYURETHANE RESIN-FORMING COMPOSITION, MODULAR MEMBRANE SEALING MATERIAL USING A CHOLOUS OR FLAT MEMBRANE FIBER SEPARATOR MEMBRANE USING THE SAYEN COMPOSITION AND ALLOPHANATE GROUP-CONTAINING POLYISOCYANATE COMPOSITION OF MDI AND MANUFACTURING METHOD THEREfor
Patent Information
- Authority / Receiving Office
- DE · DE
- Patent Type
- Patents
- Current Assignee / Owner
- TOSOH CORP
- Filing Date
- 2016-12-22
- Publication Date
- 2026-07-15
AI Technical Summary
Existing polyurethane resins used in membrane sealing materials for hollow or flat sheet fiber separation membranes face challenges in balancing reactivity, viscosity reduction, and low-temperature storage stability, and conventional catalysts for forming allophanate groups often contain metal compounds unsuitable for medical and food applications.
A composition for forming polyurethane resin containing an isocyanate component with an allophanate group, derived from diphenylmethane diisocyanate and alcohol, is developed using a tertiary amine catalyst and compounds like carboxylic acid amides or sulfonic acid amides to control the reaction without metal catalysts, maintaining low viscosity and stability.
The composition achieves improved reactivity, reduced viscosity, and low-temperature storage stability, making it suitable for medical and industrial applications without metal contamination, and allows for easy control of the reaction process.