Cleaning member and elastic member

Patent metadata

Field	Value
Publication number	US-12174576-B2
Application number	US-202318519423-A
Country	US
Kind code	B2
Filing date	Nov 27, 2023
Priority date	Jun 4, 2021
Publication date	Dec 24, 2024
Grant date	Dec 24, 2024

Abstract

Provided is a cleaning member, comprising an elastic member that includes polyurethane, wherein: when tan δ of a test piece sampled from the elastic member is measured in the temperature range of −20° C. to +60° C., the peak temperature of a peak indicating the maximum value of tan δ is at 15.0° C. or below; the maximum value of tan δ is 0.20 to 0.55; tan δ at a temperature of 55° C. is 0.13 or larger; and where the detected quantity of all ions obtained when the test piece is heated at a rate of temperature increase of 10° C./second to 1000° C. using a direct-sampling mass spectrometer is M 1 and the integrated intensity of a peak in a derived ion thermogram that corresponds to a range of m/z values originating in multifunctional isocyanate with at least three isocyanate groups is M 2 , M 2 /M 1 is at least 0.001.

First claim

What is claimed is:

1. A cleaning member comprising an elastic member comprising a polyurethane, and the cleaning member cleans a surface of a to-be-cleaned member through contact of at least a part of the elastic member against the surface of the to-be-cleaned member,
wherein in measurement with a temperature range of −20° C. to +60° C. of a loss factor tan δ of a sample sampled from the elastic member so as to include a portion of contact with the to-be-cleaned member,
a peak temperature of a peak denoting a maximum value of tan δ is present at 15.0° C. or below, and a maximum value of tan δ is from 0.20 to 0.55, and
tan δ at a temperature of 55° C. is 0.13 or larger, and
wherein, when the sample sampled from the elastic member so as to include the portion of contact with the to-be-cleaned member is heated and vaporized within an ionization chamber and heated up to 1000° C. at a ramp rate of 10° C./second by using a mass spectrometer of direct sample introduction type which ionizes molecules constituting the sample, with M 1 denoting a detected amount of all ions obtained, and M 2 denoting a peak integrated intensity in an extracted ion thermogram corresponding to a range of an m/z value derived from a polyfunctional isocyanate having three or more isocyanate groups,
M 2 /M 1 is 0.001 or higher.

2. The cleaning member according to claim 1 , wherein M 2 /M 1 is from 0.001 to 0.035.

3. The cleaning member according to claim 1 , wherein the polyurethane comprises
a reaction product of a composition comprising
an isocyanate compound including a diisocyanate and a polyfunctional isocyanate having three or more isocyanate groups; and
an alcohol including a trifunctional or higher polyfunctional alcohol.

4. The cleaning member according to claim 3 , wherein,
when the sample is heated and vaporized within an ionization chamber, and heated up to 1000° C. at a ramp rate of 10° C./second by using a mass spectrometer of direct sample introduction type which ionizes the molecules constituting the sample, with M 3 denoting a peak integrated intensity in an extracted ion thermogram corresponding to a range of an m/z value derived from the diisocyanate, M 3 /M 1 is 0.025 to 0.130.

5. The cleaning member according to claim 3 , wherein the polyfunctional isocyanate is at least one selected from the group consisting of polymeric MDI, triphenylmethane-4,4′,4″-triisocyanate and tris(phenylisocyanate)thiophosphate.

6. The cleaning member according to claim 3 , wherein the diisocyanate is at least one selected from the group consisting of 4,4′-diphenylmethane diisocyanate, 2,4-tolylene diisocyanate, 2,6-tolylene diisocyanate, xylene diisocyanate, 1,5-naphthylene isocyanate, p-phenylene diisocyanate, hexamethylene diisocyanate, isophorone diisocyanate, 4,4′-dicyclohexylmethane diisocyanate, tetramethylxylene diisocyanate and carbodiimide-modified diphenylmethane diisocyanate.

7. The cleaning member according to claim 1 , wherein the cleaning member is an electrophotographic cleaning blade.

8. The cleaning member according to claim 7 , further comprising a support member that supports the elastic member.

9. The cleaning member according to claim 1 , wherein the cleaning member is a wiper member for a wiper device for a vehicle windshield.

10. The cleaning member according to claim 9 , wherein the wiper member comprises at least a vehicle wiper support portion and a lip portion for contact with a surface of the windshield.

11. The cleaning member according to claim 9 , wherein the wiper member has at least a vehicle wiper support portion and a lip portion for contact with a surface of the windshield, and a shoulder portion on a side of the vehicle wiper support portion of the lip portion.

12. The cleaning member according to claim 9 , wherein the wiper member has at least a vehicle wiper support portion, and a lip portion that is swingably connected to the vehicle wiper support portion via a neck.

13. The cleaning member according to claim 1 , wherein the cleaning member is a cleaning member for wiping, which cleans the surface of the to-be-cleaned member through contact of the elastic member against the surface of the to-be-cleaned member.

14. The cleaning member according to claim 13 , wherein the cleaning member has the elastic member contacting the surface of the to-be-cleaned member, and an elastic member support portion that supports the elastic member over a longitudinal direction of the elastic member.

15. An elastic member comprising a polyurethane, wherein
when a loss factor tan δ of a sample sampled from the elastic member is measured in a temperature range of −20° C. to +60° C.,
a peak temperature of a peak denoting a maximum value of tan δ is present at 15.0° C. or below, and a maximum value of tan δ is from 0.20 to 0.55, and
tan δ at a temperature of 55° C. is 0.13 or larger, wherein,
when the sample sampled from the elastic member is heated and vaporized within an ionization chamber and heated up to 1000° C. at a ramp rate of 10° C./second by using a mass spectrometer of direct sample introduction type which ionizes molecules constituting the sample, and with M 1 denoting a detected amount of all ions obtained, and M 2 denoting a peak integrated intensity in an extracted ion thermogram corresponding to a range of an m/z value derived from a polyfunctional isocyanate having three or more isocyanate groups,
M 2 /M 1 is 0.001 or higher.

16. The elastic member according to claim 15 , wherein M 2 /M 1 is from 0.001 to 0.035.

17. The elastic member according to claim 15 , wherein the polyurethane comprises
a reaction product of a composition comprising
an isocyanate compound including a diisocyanate and a polyfunctional isocyanate having three or more isocyanate groups; and
an alcohol including a trifunctional or higher polyfunctional alcohol.

18. The elastic member according to claim 17 , wherein,
when the sample is heated and vaporized within an ionization chamber, and heated up to 1000° C. at a ramp rate of 10° C./second by using a mass spectrometer of direct sample introduction type which ionizes the molecules constituting the sample, with M 3 denoting a peak integrated intensity in an extracted ion thermogram corresponding to a range of an m/z value derived from the diisocyanate, M 3 /M 1 is 0.025 to 0.130.

Assignees

• Canon Kk

Inventors

• Yokoyama Masanori
• Terada Kenya
• Aoyama Takehiko
• Segawa Shota
• Kato Hisao
• Kunieda Mitsuhiro
• Yamamoto Arihiro

Classifications

• C08G18/721

  Two or more polyisocyanates not provided for in one single group C08G18/73 - C08G18/80 · CPC title

• C08G18/776

  phosphorus · CPC title

• C08G18/10

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

• C08G18/7671

  containing only one alkylene bisphenyl group · CPC title

• B08B1/16

  Rigid blades, e.g. scrapers; Flexible blades, e.g. wipers · CPC title