Functionalized polyoxymethylene block copolymers
US-2015368396-A1 · Dec 24, 2015 · US
NCO-modified polyoxymethylene block copolymers
US9534090B2 · US · B2
| Field | Value |
|---|---|
| Publication number | US-9534090-B2 |
| Application number | US-201314654640-A |
| Country | US |
| Kind code | B2 |
| Filing date | Dec 16, 2013 |
| Priority date | Dec 21, 2012 |
| Publication date | Jan 3, 2017 |
| Grant date | Jan 3, 2017 |
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- Title
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Abstract
Official abstract text for this publication.
The invention relates to a method for producing NCO-modified polyoxymethylene block copolymers comprising the step of polymerizing formaldehyde in a reaction vessel in the presence of a catalyst, the polymerization of formaldehyde in addition taking place in the presence of a starter compound comprising at least 2 Zerewitinoff active H atoms to obtain an intermediate product. The intermediate product obtained is reacted further with an isocyanate to obtain an NCO-modified polyoxymethylene block copolymer. The invention also relates to NCO-modified polyoxymethylene block copolymers obtained by a method of this type and to the use of said copolymers for producing polyurethane polymers.
First claim
Opening claim text (preview).
The invention claimed is: 1. A process for preparing NCO-modified polyoxymethylene block copolymers, comprising the step of polymerizing gaseous formaldehyde in the presence of a catalyst selected from the group consisting of basic catalysts, Lewis-acidic catalysts, and combinations thereof, to form a polyoxymethylene block copolymer intermediate, wherein the polymerization of formaldehyde is effected in the presence of a starter compound having at least two Zerewitinoff-active hydrogen atoms, giving an intermediate having a number-average molecular weight of <4500 g/mol, and reacting the intermediate with an isocyanate in the presence of a catalyst which is the same catalyst as in the preceding polymerization of formaldehyde, to give an NCO-modified polyoxymethylene block copolymer. 2. The process as claimed in claim 1 , wherein the starter compound has a number-average molecular weight of ≧100 g/mol to ≦3000 g/mol. 3. The process as claimed in claim 1 , wherein the starter compound is an oligomeric compound. 4. The process as claimed in claim 1 , wherein the starter compound is selected from the group consisting of polyether polyols, polyester polyols, polyether ester polyols, polycarbonate polyols, polyacrylate polyols, and combinations thereof. 5. The process as claimed in claim 1 , wherein the isocyanate is an aliphatic or aromatic di- or polyisocyanate. 6. The process as claimed in claim 1 , wherein the polymerization is additionally effected in the presence of a comonomer.
Assignees
Inventors
Classifications
- C08G18/56Primary
Polyacetals · CPC title
Monoisocyanates or monoisothiocyanates · CPC title
containing oxygen {(cyclic ether compounds C08G65/26)} · CPC title
containing isocyanate group · CPC title
- C08G81/00Primary
Macromolecular compounds obtained by interreacting polymers in the absence of monomers, e.g. block polymers (involving only carbon-to-carbon unsaturated bond reactions C08F299/00 {; polyester-amides C08G69/44; polyester-imides C08G73/16; polyamides-imides C08G73/14; block- or graft polymers containing polysiloxane sequences C08G77/42}) · CPC title
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- What does patent US9534090B2 cover?
- The invention relates to a method for producing NCO-modified polyoxymethylene block copolymers comprising the step of polymerizing formaldehyde in a reaction vessel in the presence of a catalyst, the polymerization of formaldehyde in addition taking place in the presence of a starter compound comprising at least 2 Zerewitinoff active H atoms to obtain an intermediate product. The intermediate p…
- Who is the assignee on this patent?
- Covestro Deutschland Ag
- What technology area does this patent fall under?
- Primary CPC classification C08G18/56. Mapped technology areas include Chemistry & Metallurgy.
- When was this patent published?
- Publication date Tue Jan 03 2017 00:00:00 GMT+0000 (Coordinated Universal Time) (B2). Legal status and post-grant events are not shown on this page.
- What related patents are in patentsdb?
- We list 3 related publications on this page (citations in our corpus or others sharing the same primary CPC).