US 12,214,565 B2
Pneumatic tire and method of manufacturing the same
Takashi Hoshiba, Hiratsuka (JP); and Masahiro Naruse, Hiratsuka (JP)
Assigned to The Yokohama Rubber Co., LTD., Tokyo (JP)
Appl. No. 16/484,810
Filed by The Yokohama Rubber Co., LTD., Tokyo (JP)
PCT Filed Nov. 14, 2017, PCT No. PCT/JP2017/040960
§ 371(c)(1), (2) Date Aug. 8, 2019,
PCT Pub. No. WO2018/146885, PCT Pub. Date Aug. 16, 2018.
Claims priority of application No. 2017-021294 (JP), filed on Feb. 8, 2017.
Prior Publication US 2020/0023599 A1, Jan. 23, 2020
Int. Cl. B29D 30/06 (2006.01); B29C 33/58 (2006.01); B60C 19/00 (2006.01)
CPC B29D 30/0681 (2013.01) [B29C 33/58 (2013.01); B60C 19/002 (2013.01)] 19 Claims
OG exemplary drawing
 
1. A pneumatic tire comprising a noise absorber fixed on an inner surface of a tread portion along a tire circumferential direction via an adhesive layer, and a release agent between the adhesive layer and the tread portion having a thickness as detected by an electron microscope of 0.1 μm to 100 μm at least in a fixation region for the noise absorber; wherein
the adhesive layer is in contact with the release agent,
the release agent consists only of one or more selected from the group consisting of a dialkylpolysiloxane, an alkyl aralkyl polysiloxane, a 3,3,3-trifluoropropylmethylpolysiloxane, or combinations thereof,
a hardness of the noise absorber is greater than 80 N and less than or equal to 150 N, a tensile strength of the noise absorber is equal to or greater than 90 kPa, and a breaking elongation of the noise absorber is equal to or greater than 200%, and
the adhesive layer is formed by a double-sided adhesive tape, and has a total thickness in a range of 10 μm to 150 μm.
 
10. A method for manufacturing a pneumatic tire, the method comprising: vulcanizing a green tire using a bladder having a coating layer formed by a release agent; and fixing a noise absorber to a fixation region for the noise absorber on an inner surface of a tread portion of the vulcanized pneumatic tire along a tire circumference direction via an adhesive layer, with a thickness of the release agent between the adhesive layer and the tread portion of the vulcanized pneumatic tire as detected by an electron microscope being 0.1 μm to 100 μm at least in the fixation region for the noise absorber; wherein
the adhesive layer is in contact with the release agent,
the release agent consists only of one or more selected from the group consisting of a dialkylpolysiloxane, an alkyl aralkyl polysiloxane, a 3,3,3-trifluoropropylmethylpolysiloxane, or combinations thereof,
a hardness of the noise absorber is greater than 80 N and less than or equal to 150 N, a tensile strength of the noise absorber is equal to or greater than 90 kPa, and a breaking elongation of the noise absorber is equal to or greater than 200%,
the adhesive layer is formed by a double-sided adhesive tape and has a total thickness in a range of 10 μm to 150 μm.