Trimerized Pentamethylenediisocyanate

Patent Title: METHOD FOR MODIFYING AT LEAST PENTAMETHYLENE DIISOCYANATE BY MEANS OF SPIROCYCLIC AMMONIUM SALTS AS CATALYST

 Number/Link:WO2018/153801 (German)

Applicant/Assignee:  Covestro

Publication date: 30 August 2018

Gist”: PDI is trimerized using a spirocyclic ammonium salt

Why it is interesting: The oligomerization of diisocyanates by trimerization or dimerization is well known.  Diisocyanates are partially trimerized using a catalyst which is “killed” when the desired conversion is reached. The remaining monomer is then removed. In this invention pentamethylenediisocyanate is trimerized using a spirocyclic ammonium salt as catalyst, which apparently results in a desirable amount of asymmetric trimer (i.e. iminooxadiazinedione groups) as opposed to symmetric trimer (isocyanurate groups).  In the examples 5-azo-spiro[4,5]decane hydrogendifluoride is used as catalyst.

spiro catalyst

Spirocyclic ammonium salt used as catalyst in the invention

Bioabsorbable Thermoplastic Polyurethane

Patent Title: BIODEGRADABLE AND/OR BIOABSORBABLE THERMOPLASTIC POLYURETHANES

 Number/Link: WO2018/140912

Applicant/Assignee:  Lubrizol

Publication date: 2 august 2018

Gist”: TPU breaks down into non-toxic components

Why it is interesting: The invention is related to biodegradable TPU for medical use in vivo. The TPU is prepared from isocyanates, polyols and chain extenders that biodegrade into non-toxic products, e.g. hexane diisocyanate, butanediisocyanate, lysine diisocyanate, poly(ε-caprolactone), polyglycolide, dipropylene glycol, diethyleneglycol etc.  The TPUs are prepared at a hardblock content of 15-45% (pref).
I strongly doubt that this case is patentable because the same compositions are disclosed inanother Lubrizol application discussed before in this blog.

LDI

Lysine diisocyanate

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UV Resistant Viscoelastic Foams

Patent Title: POLYURETHANE PRODUCT WITH SULFUR-CONTAINING POLYOL

 Number/Link: WO2018/111806

Applicant/Assignee:  Dow

Publication date: 21 June 2018

Gist”: VE foams using S-containing polyether polyols

Why it is interesting: According to this invention sulfur containing polyols improve the UV resistance of polyurethane materials.  It is believed that sulfur acts as a UV absorber incorporated into the polymer, thereby reducing the need for additives such as antioxidants.  In the examples an S-containing polyether diol is prepared by reacting 2,2′-thiodiethanol with propyleneoxide up to an OH value of  188 mg KOH/g. The diol is then used in an amount of 5 to 15% on the total polyol blend to prepare low resilience flexible foams showing an improved UV resistance.

 

TDE

2,2′-thiodiethanol

 

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