Member surface treatment method and method for producing multilayer member

1. A member surface treatment method for treating a surface of a member containing a crystallizable thermoplastic resin by a dry treatment, wherein the dry treatment is performed to satisfy conditions X and Y:

Condition X: γ d /γ d0 is not less than 1.0 and less than 1.4; and

Condition Y: γ p /γ p0 is not less than 1.2 and less than 40,

where γ d0 is a non-polar component of surface free energy of the surface before the dry treatment, γ d is a non-polar component of surface free energy of the surface after the dry treatment, γ p0 is a polar component of surface free energy of the surface before the dry treatment, and γ p is a polar component of surface free energy of the surface after the dry treatment.

2. The member surface treatment method according to claim 1 , wherein

the dry treatment includes a plurality of single dry treatments, and

the surface free energy of the surface subjected to the single dry treatments is increased with the number of the single dry treatments increased in the whole treatment process of the dry treatment.

3. A method for producing a multilayer member having a first member containing a crystallizable thermoplastic resin, an adhesion layer, and a second member in this order, the method comprising:

a surface treatment step of performing a surface treatment on a surface of the first member by the member surface treatment method according to claim 2 ;

an adhesive application step of applying an adhesive to the surface of the first member subjected to the dry treatment without a primer composition, to form an adhesive layer on the surface of the first member; and

an adhering step of adhering the second member to the adhesive layer.

4. The method for producing a multilayer member according to claim 3 , further comprising a surface treatment step of performing a surface treatment on a surface of the second member before the adhering step by the member surface treatment method,

wherein the second member contains a crystallizable thermoplastic resin, and

in the adhering step, the surface of the second member in which the surface treatment is performed is adhered to the adhesive layer.

5. The method for producing a multilayer member according to claim 3 , further comprising a surface treatment step of performing a surface treatment on a surface of the second member before the adhering step by a second member surface treatment method for treating the second member by a second dry treatment, wherein:

the second dry treatment is performed to satisfy conditions X 2 and Y 2 :

Condition X 2 : γ d 2 /γ d0 2 is not less than 1.0 and less than 1.4; and

Condition Y 2 : γ p 2 /γ p0 2 is not less than 1.2 and less than 40,

where γ d0 is a second non-polar component of surface free energy of the surface before the dry treatment, γ d 2 is a second non-polar component of surface free energy of the surface after the dry treatment, γ p0 2 is a second polar component of surface free energy of the surface before the dry treatment, and γ p 2 is a second polar component of surface free energy of the surface after the dry treatment;

the second member contains a crystallizable thermoplastic resin; and

in the adhering step, the surface of the second member in which the surface treatment is performed is adhered to the adhesive layer.

6. A method for producing a multilayer member having a first member containing a crystallizable thermoplastic resin, an adhesion layer, and a second member in this order, the method comprising:

a surface treatment step of performing a surface treatment on a surface of the first member by the member surface treatment method according to claim 1 ;

an adhesive application step of applying an adhesive to the surface of the first member subjected to the dry treatment without a primer composition, to form an adhesive layer on the surface of the first member; and

an adhering step of adhering the second member to the adhesive layer.

7. The method for producing a multilayer member according to claim 6 , further comprising a surface treatment step of performing a surface treatment on a surface of the second member before the adhering step by the member surface treatment method,

wherein the second member contains a crystallizable thermoplastic resin, and

in the adhering step, the surface of the second member in which the surface treatment is performed is adhered to the adhesive layer.

8. The method for producing a multilayer member according to claim 6 , further comprising a surface treatment step of performing a surface treatment on a surface of the second member before the adhering step by a second member surface treatment method for treating the second member by a second dry treatment, wherein:

the second dry treatment is performed to satisfy conditions X 2 and Y 2 :

Condition X 2 : γ d 2 /γ d0 2 is not less than 1.0 and less than 1.4; and

Condition Y 2 : γ p 2 /γ p0 2 is not less than 1.2 and less than 40,

where γ d0 is a second non-polar component of surface free energy of the surface before the dry treatment, γ d 2 is a second non-polar component of surface free energy of the surface after the dry treatment, γ p0 2 is a second polar component of surface free energy of the surface before the dry treatment, and γ p 2 is a second polar component of surface free energy of the surface after the dry treatment;

the second member contains a crystallizable thermoplastic resin;

the second dry treatment includes a plurality of single dry treatments;

the surface free energy of the surface subjected to the single dry treatments is increased with the number of the single dry treatments increased in the whole treatment process of the second dry treatment; and

in the adhering step, the surface of the second member in which the surface treatment is performed is adhered to the adhesive layer.