Infrared Curable 2K PU Adhesives


 Number/Link: WO2016/205251 and related cases: WO..5252, WO…5254 and WO..5255

Applicant/Assignee: Dow

Publication date: all published on 22 dec 2016

Gist”: Two-component PU adhesive using 3 different delayed-action catalysts

Why it is interesting: Two component adhesive systems need a sufficiently long ‘open time’ preferably combined with a fast cure once activated, e.g. by heat. Heat curing using infrared radiation allows for ‘spot curing’ , i.e. curing only predetermined parts of the adhesive such that the assembly can be handled and can be cured completely in a subsequent step.  This process is fast and saves energy.  The current invention is about IR curable adhesives containing 3 different types of latent catalysts: a latent room temperature organometallic catalyst based on Sn, Zn or Bi added to the polyol component, a phenol-blocked cyclic amidine and a carboxylic acid blocked cyclic amidine.  The two latter catalysts can either be included in the polyol or in the isocyanate component. The catalysts used in the examples are dioctyltinthioglycolate, phenol blocked 1,8-diazabicycloundec-7-ene and a carboxilic acid blocked 1,8-diazabicycloundec-7-ene.




Improved P.I.P. Foams

Title: Foam Composition and its Uses Thereof

 Number/Link: US2014/079940


Publication date: 20-03-2014 (priority PCT)

Gist”: Use of 4 catalysts:  2 ‘normal’ and 2 ‘delayed action’ are used to formulate pour-in-place foams that resist fabric penetration.

Why it is interesting: “Pour in place” or “in situ” foaming is a technique where a flexible foam-forming mixture is poured directly onto fabric to (typically) produce car seats. The fabrics used are often laminated with a thermoplastic film or a layer of polyester PU foam to prevent penetration of the foaming mixtures.  These liners however impair breathability and therefore comfort. The current invention should allow use of liner-free fabrics without strike through. Four different catalysts are used:  a normal gelling catalyst, a normal blowing catalyst a delayed action gelling catalyst and a delayed action blowing catalyst. The delayed action catalysts are conventional amine catalysts reacted with a suitable acid like lactic acid and become active at a temperature of around 50°C. When poured on a fabric-lined and heated mould, a flexible foam mixture formulated with these catalysts should gel imediately and not penetrate the fabric.

Pour-in-place technique:  2: mould, 3 fabric, 7 foam forming mixture.

Pour-in-place technique: 2: mould, 3 fabric, 7 foam forming mixture.

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