PU Elastomers from SGO Polymerized Acrylic Polyols

Patent Title: PHYSICAL PROPERTY IMPROVEMENT OF POLYURETHANES

 Number/Link: WO2018/132648

Applicant/Assignee:  BASF

Publication date: 19 July 2018

Gist”: Solvent-free acrylate polyols are reacted together with polyether polyols and diisocyanates

Why it is interesting: In this invention a solvent-free (“100% solids” in the patent’s terminology) acrylic polyol is blended with a conventional polyether polyol and reacted with an aliphatic or aromatic diisocyanate.  The acrylic polyol is prepared by co-polymerizing (e.g.)  ethyl- or butyl (meth)acrylates, styrene and a hydroxyl functional acrylate like 2-hydroxyethyl acrylate or 4-hydroxybutyl acrylate, using BASF’s “solid grade oligomer” (SGO) polymerization process. The SGO process is a high temperature and high pressure continuous process allowing for the production of low-solvent acrylic resins. The polyurethanes are said to have increased physical properties, esp. tear- and tensile strength properties.

HBA

Hydroxybutylacrylate

Flexible Foams with Improved Humid-Aged Properties

Title: POLYURETHANE FOAM PRODUCTION PROCESS, PRE-MIX, FORMULATION, AND PRODUCT

 Number/Link: WO2013/143129

Applicant/Assignee: Air Products

Publication date: 3-10-2013

Gist”: Use of halohydrins as an additive in flexible foam formulations improves humid aged properties.

Why it is interesting: Properties of flexible polyurethane foams after humid-ageing appear to greatly improve when about 0.5 to 1 pphp of a halohydrin is added to the formulation.  “Halohydrin” is in this case used as a synonym for halo-alcohol. Mentioned are 2-(2-chloroethoxy)ethanol, 2,2-dichloroethanol and 1-chhloro-6-hexanol e.g. According to the examples the effect appears to be real and most pronounced for mechanical properties after humid ageing viz. tensile and elongation properties. It is not immediately clear to me what the underlying mechanism could be.

Chloroethoxyethanol

Chloroethoxyethanol