Vehicle wiper blade

Patent metadata

Field	Value
Publication number	US-12410275-B2
Application number	US-202318158633-A
Country	US
Kind code	B2
Filing date	Jan 24, 2023
Priority date	Jul 31, 2020
Publication date	Sep 9, 2025
Grant date	Sep 9, 2025

Abstract

A vehicle wiper blade comprises a blade support part and a lip part coupled swingably with the blade support part via a neck. The lip part comprises polyurethane. The polyurethane comprises a reactant of a composition including an isocyanate compound which includes diisocyanate and tri- or higher functional polyfunctional isocyanate, and an alcohol which includes tri- or higher functional polyfunctional alcohol. The diisocyanate has an aromatic ring in a molecule. When a molecule of the polyurethane is ionized with a mass spectrometer of a direct sample injection system, then obtained M1, M2 and M3 satisfy the following relation: M2/M1 is 0.001 to 0.028, M3/M1 is 0.020 to 0.110, and M2/M3 is 0.013 to 0.300, and a concentration of the polyfunctional alcohol in the polyurethane is 0.12 mmol/g to 0.65 mmol/g.

First claim

What is claimed is:

1. A vehicle wiper blade comprising:
a blade support part;
a neck; and
a lip part coupled swingably with the blade support part via the neck, the neck being narrowed in width with respect to the blade support part and the lip part in a cross section in a direction orthogonal to a longitudinal direction of the wiper blade,
a part of the lip part being brought into contact with a surface of a to-be-cleaned member, and thereby the surface of the to-be-cleaned member being cleaned,
the lip part comprising polyurethane, the polyurethane comprising a reactant of a composition including:
an isocyanate compound which includes diisocyanate and tri- or higher functional polyfunctional isocyanate; and
an alcohol which includes tri- or higher functional polyfunctional alcohol,
the diisocyanate having an aromatic ring in a molecule thereof,
wherein when the polyurethane is heated up to 1000° C. at a temperature rise rate of 10° C./s using a mass spectrometer of direct sample introduction type in which a sample is heated and vaporized in an ionization chamber and a molecule of the sample is ionized, then obtained
a detected amount of all ions is defined as M1,
an integrated intensity of a peak in an extracted ion thermogram corresponding to a range of an m/z value derived from the tri- or higher functional polyfunctional isocyanate is defined as M2, and
an integrated intensity of a peak in an extracted ion thermogram corresponding to a range of an m/z value derived from the diisocyanate is defined as M3,
M2/M1 is 0.001 to 0.028,
M3/M1 is 0.020 to 0.110,
M2/M3 is 0.013 to 0.300, and
a concentration of the tri- or higher functional polyfunctional alcohol in the polyurethane is 0.12 mmol/g to 0.65 mmol/g.

2. The vehicle wiper blade according to claim 1 , wherein
the M2/M1 is 0.001 to 0.015,
the M3/M1 is 0.040 to 0.100,
the M2/M3 is 0.013 to 0.150, and
the concentration of the tri- or higher functional polyfunctional alcohol in the polyurethane is 0.22 mmol/g to 0.39 mmol/g.

3. The vehicle wiper blade according to claim 1 , wherein the diisocyanate has a structure in which NCO is directly bonded to the aromatic ring.

4. The vehicle wiper blade according to claim 1 , wherein the tri- or higher functional polyfunctional isocyanate is at least one selected from the group consisting of polymeric MDI, triphenyl methane-4,4′,4″-triisocyanate, and tris(phenyl isocyanate)thiophosphate.

5. The vehicle wiper blade according to claim 1 , wherein the tri- or higher functional polyfunctional alcohol is at least one selected from the group consisting of alcohols expressed by formulae (a), alcohols expressed by formulae (b), and pentaerythritol:

where in the formulae (a) and (b), R 1 and R 2 each independently represent H, CH 3 , or C 2 H 5 .

Assignees

• Canon Kk

Inventors

• Segawa Shota
• Aoyama Takehiko
• Yokoyama Masanori
• Matsuda Hidekazu
• INOUE Syoji
• Yamamoto Arihiro
• Ikeda Youhei

Classifications

• C08G18/7664 Primary

  containing alkylene polyphenyl groups · CPC title

• C08G18/6644

  having at least three hydroxy groups · CPC title

• C08G18/4283

  Hydroxycarboxylic acid or ester · CPC title

• C08G18/3206

  aliphatic · CPC title

• C08G18/10

  Prepolymer processes involving reaction of isocyanates or isothiocyanates with compounds having active hydrogen in a first reaction step · CPC title