All posts by Gerhard Bleys

Carbamate Blown Rigid Foams

Patent Title: A METHOD FOR PRODUCING AN OPEN CELL RIGID POLYURETHANE FOAM

 Number/Link: WO2018096101  WO2018096102

Applicant/Assignee:  Covestro

Publication date: 31 may 2018

“Gist”: An open cell rigid foam is prepared using an amine-CO2 adduct and water as blowing agents

Why it is interesting: According to this invention an open cell rigid spray foam can be prepared from a conventional rigid foam formulation and a blowing agent consisting of 4-12 parts (pref.) on 100 parts of polyol of an adduct of a primary or secondary amine and carbon dioxide, together with 15 to 50 parts of water.  The properties of the resulting open cell, low density foam are said to be largely independent of ambient conditions and spray thickness. The foams are useful for thermal insulation applications in construction.

carbamate

Carbamate of N,N-dimethylaminopropylamine

 

Leave a comment
by Gerhard Bleys on June 8, 2018  •  Permalink
Posted in Rigid Foams
Tagged , , , , , ,

Posted by Gerhard Bleys on June 8, 2018

https://purpatents.com/2018/06/08/carbamate-blown-rigid-foams/

Foamed and Coloured TPU Pellets

Patent Title: PROCESS FOR DYEING AND FOAMING THERMOPLASTIC POLYURETHANE

 Number/Link: WO2018/091446

Applicant/Assignee:  Huntsman

Publication date: 24 May 2018

“Gist”: TPU pellets are both coloured and foamed using supercritical carbon dioxide.

Why it is interesting: According to this invention, coloured and foamed thermoplastic polyurethanes can be prepared by saturating TPU pellets (in an autoclave under controlled temperature and pressure) with supercritical CO2 together with a dye.  After impregnation is complete the pressure is dropped at a temperature between the TPU’s Tg and Tm, resulting in expanded TPU pellets or ‘beads’.  The process has the advantage of allowing for the use of a wider range of dyes as compared to conventional pigment-based colours. The TPU beads are said to be especially useful for the production of shoe-soles colour-matched with textiles.

azo compound

Typical azo compound used in dispersion dyes

Leave a comment
by Gerhard Bleys on May 25, 2018  •  Permalink
Posted in dispersions, Thermoplastics
Tagged , , , , , , , , ,

Posted by Gerhard Bleys on May 25, 2018

https://purpatents.com/2018/05/25/foamed-and-coloured-tpu-pellets/

Hybrid Polyisocyanurates for Composites and Coatings

Patent Title: DUAL-CURING ISOCYANURATE POLYMERS

 Number/Link:WO2018/087395 WO2018/087396  WO2018/087399 (German)

Applicant/Assignee:  Covestro

Publication date: 17 May 2018

“Gist”:  Di-isocyanate trimer is reacted with hydroxymethacrylates and polyacrylates in the presence of a trimerization catalyst. 

Why it is interesting: According to these inventions a reaction system with two curing modes can be prepared by mixing high functionality oligomeric isocyanate, ethylenically unsaturated compounds, unsaturated compounds containing isocyanate-reactive groups, timerization catalyst and a free-radical initiator at an NCO index of 100 to 200. The system shows a relatively low viscosity and can e.g. be used in fiber-reinforced composites and in coatings. In the examples HDI trimer is reacted with hexanedioldimethacrylate and hydroxypropylmethacrylate in the presence of potassium acetate and a peroxybenzoic acid.

HDI isocyanurate

HDI-trimer


Leave a comment
by Gerhard Bleys on May 18, 2018  •  Permalink
Posted in Adhesives-Coatings, composites
Tagged , , , , , , , , , ,

Posted by Gerhard Bleys on May 18, 2018

https://purpatents.com/2018/05/18/hybrid-polyisocyanurates-for-composites-and-coatings/

« Older Posts
Newer Posts »

  • Pages

  • Categories

  • Enter your email address to follow this blog and receive notifications of new posts by email.

    Join 259 other subscribers