All posts tagged Environment

TPU from Biorenewable Isocyanate

Patent Title: BIO-BASED DIISOCYANATE AND CHAIN EXTENDERS IN CRYSTALLINE SEGMENTED THERMOPLASTIC POLYESTER URETHANES

Number/Link: WO2016041076

Applicant/Assignee: Trent University

Publication date: 24-03-2016

“Gist”: TPU with highly crystalline hard segment is based on 1,7 heptamethylenediisocyanate

Why it is interesting: According to this application, polyester TPUs with crystalline hard segments can be produced using 1,7-heptamethylenediisocyanate. The HPMDI is reacted with a 2000MW poly(ethyleneadipate) diol and a short chain diol as chain extender. The TPUs show a high hard-segment crystallinity, resulting in improved phase separation and in a (semi-)crystalline softphase which has a significant reinforcement effect. The TPUs are thermally stable up to 250°C and show a toughness and strength comparable to conventional TPUs. HPMDI can reportedly be made from natural oils using the Curtius rearrangement – but no reference is given.

Curtius Rearrangment

3 Comments

by Gerhard Bleys on March 25, 2016 • Permalink

Posted in Isocyanates and Prepolymers, Thermoplastics

Tagged aliphatic isocyanates, bio-based materials, chain extender, elastomers, Environment, glass transition, oils, polyester polyol, prepolymer, renewable materials, TPE, TPU, triglycerids

Posted by Gerhard Bleys on March 25, 2016

https://purpatents.com/2016/03/25/tpu-from-biorenewable-isocyanate/

PUDs for Superhydrophobic Coatings

Patent Title: Vegetable Oil-Modified, Hydrophobic Polyurethane Dispersions

Number/Link: US20160009852

Applicant/Assignee: Rust-Oleum

Publication date: 14-01-2016

“Gist”: PUDs containing saturated monoglycerids

Why it is interesting: Aqueous polyurethane dispersions are popular for use in environmentally friendly coating compositions. Because of the inherent presence of hydrophilic (often acid-) groups to stabilise these dispersions, the resulting coatings often lack hydrolytic stability. According to this invention, this can be improved by incorporating monoglycerids, prepared by reacting vegetable oils with glycerol followed by distillation, into the PU backbone. A prepolymer is prepared by reacting the monoglicerids, together with a non-isocyanate urethane polyol (prepared from polyamines and monocyclic carbonates), a conventional long-chain polyol and dimethylolpropionic acid, with an excess of isocyanate. The prepolymer is then neutralized with an amine and subsequently reacted with a chain extender in water to make the PUD. Coatings made with these dispersions are said to be superhydrophobic and have a low friction coeficient.

Dimethylolpropionic acid

Polyurethane Foams with Reduced Acetaldehyde Emissions

Patent Title: POLYURETHANES WITH REDUCED ALDEHYDE EMISSION

Number/Link: WO2015/189095

Applicant/Assignee: BASF

Publication date: 17-12-2015

“Gist”: A polymer with pending -O-NH2 groups is used as additive

Why it is interesting: The reduction of VOC emissions, especially emissions of aldehydes from PU foams, remains an important topic of research. A number of solutions have been proposed, for example the use of polyamines as scavengers as discussed before. There still appears to be a need for improvement however, especially for the reduction of acetaldehyde emissions. According to this invention acetaldehyde emissions can be reduced by using a relatively high mole-weight polymer with pending aminooxy groups as an additive during foaming. In an example a copolymer of 4-aminooxymethylstyrene and methacrylic acid with a Mn of about 15,000 is used as an additive.

4-aminooxymethylstyrene

Innovation in Polyurethanes

All posts tagged Environment

TPU from Biorenewable Isocyanate

PUDs for Superhydrophobic Coatings

Polyurethane Foams with Reduced Acetaldehyde Emissions

Pages

Categories

Search

Follow this blog via email

Follow Innovation in PU on Twitter