Urethane resin comprising a polyrotaxane and polishing pad
US-2019263961-A1 · Aug 29, 2019 · US
Bound stopper and production method therefor
US10968306B2 · US · B2
| Field | Value |
|---|---|
| Publication number | US-10968306-B2 |
| Application number | US-201816155446-A |
| Country | US |
| Kind code | B2 |
| Filing date | Oct 9, 2018 |
| Priority date | Oct 11, 2017 |
| Publication date | Apr 6, 2021 |
| Grant date | Apr 6, 2021 |
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- Title
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Abstract
Official abstract text for this publication.
The present invention is to provide a bound stopper, which has high mechanical strength, is excellent in durability against fatigue breaking, settling or the like when a heavy load is repeatedly received, and is easy to be produced, in which the bound stopper comprises a polyurethane foam obtained from a polyurethane foam composition containing an isocyanate component and a blowing agent, and the isocyanate component contains a urethane prepolymer having an isocyanate group, the urethane prepolymer being obtained from a polyol component, a polyrotaxane containing a cyclic molecule having an active hydrogen group as a constituent, and an isocyanate.
First claim
Opening claim text (preview).
What is claimed is: 1. A bound stopper which is made of a polyurethane foam and is to be mounted on a piston rod of a shock absorber for a vehicle, the bound stopper comprising: a polyurethane foam obtained from a polyurethane foam composition containing an isocyanate component and a blowing agent, wherein the isocyanate component contains a urethane prepolymer having an isocyanate group, the urethane prepolymer being obtained from a polyol component, a polyrotaxane containing a cyclic molecule having an active hydrogen group as a constituent, and an isocyanate, and the urethane prepolymer having an isocyanate group has an NCO % of 2.5% to 7.5%. 2. The bound stopper according to claim 1 , wherein in the urethane prepolymer having an isocyanate group, an amount of the polyrotaxane is 0.1 part by weight to 6.5 parts by weight based on 100 parts by weight of the polyol component. 3. The bound stopper according to claim 1 , wherein the polyurethane foam has a density of 0.3 g/cm 3 to 0.6 g/cm 3 . 4. A method for procuring a bound stopper which is made of a polyurethane foam and is to be mounted onto a piston rod of a shock absorber for a vehicle, the method comprising: preparing a urethane prepolymer having an isocyanate group by heating and mixing a polyol component and a polyrotaxane containing a cyclic molecule having an active hydrogen group as a constituent in a molten state, and thereafter blending the mixture with an isocyanate; and injecting a polyurethane foam composition containing the urethane prepolymer having an isocyanate group and a blowing agent into a mold and foaming the same, so as to form the bound stopper made of a polyurethane foam. 5. The method according to claim 4 , wherein the urethane prepolymer having an isocyanate group has an NCO % of 2.5% to 7.5%.
Assignees
Inventors
Classifications
- C08G18/4854Primary
Polyethers containing oxyalkylene groups having four carbon atoms in the alkylene group · CPC title
prepared using water as the sole blowing agent · CPC title
cellular or porous · CPC title
derived from dicarboxylic acids and dialcohols · CPC title
flexible · CPC title
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Frequently asked questions
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- What does patent US10968306B2 cover?
- The present invention is to provide a bound stopper, which has high mechanical strength, is excellent in durability against fatigue breaking, settling or the like when a heavy load is repeatedly received, and is easy to be produced, in which the bound stopper comprises a polyurethane foam obtained from a polyurethane foam composition containing an isocyanate component and a blowing agent, and t…
- Who is the assignee on this patent?
- Basf Inoac Polyurethanes Ltd, Toyota Motor Co Ltd
- What technology area does this patent fall under?
- Primary CPC classification C08G18/4854. Mapped technology areas include Chemistry & Metallurgy.
- When was this patent published?
- Publication date Tue Apr 06 2021 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 5 related publications on this page (citations in our corpus or others sharing the same primary CPC).