JPS60215054A - Transparent polyamide composition - Google Patents

Abstract

PURPOSE:The titled composition having improved flexibility without deteriorating the transparency, obtained by incorporating polyamide 12 or polyamide 11 into a specified transparent polyamide. CONSTITUTION:Lauryl lactam, 12-aminododecanoic acid or 11-amino-undecanoic acid, and bis(4-aminocyclohexyl)methane, as essential monomer components, are copolymerized with monomers such as isophthalic acid, terephthalic acid, or isophoronediamine to obtain a transparent polyamide containing a cyclic compound. The obtained polyamide is incorporated with 5-50pts.wt. polyamide 12 or polyamide 11.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to transparent polyamide resin compositions with improved flexibility.

Transparent polyamide is characterized by its chemical resistance, heat resistance, impact resistance,
Because of its cold resistance, it is used for shower handles, oil filters, various covers, housings, eyeglass frames, etc.

Among these, it is particularly suitable for use in eyeglass frames.

Due to its chemical composition, transparent polyamide contains a large amount of cyclic compounds, has high rigidity, and has excellent impact resistance and cold resistance.
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However, when used in eyeglass frames, if the rigidity is too high, the lenses will not fit into the frame. Otherwise, problems such as damage to the frame and lens may occur.

Therefore, it is necessary to make the resin flexible by changing the elastic modulus of the resin depending on the shape, thickness, etc. of the frame. To solve this problem, manufacturers are trying to change the stiffness or elastic modulus by changing the polymer composition.

However, when improving physical properties by going against the polymerization process, it is difficult to respond precisely to the needs of users, and increasing the grade increases costs, which is not economical.

The inventors of the present invention have solved the above problem (as a result of intensive studies, they have found that nylon 12 or nylon 1 is made of transparent polyamide.
By blending and molding 1, it became possible to supply a transparent polyamide with improved flexibility without impairing transparency.

That is, in the present invention, 5 parts by weight of polyamide 12 or polyamide 11 is added to 100 parts by weight of a transparent polyamide containing a cyclic compound containing lauryllactam, 12-aminododecanoic acid or 11-aminoundecanoic acid, and bis(4-aminocyclohexyl)methane as essential monomer components. The present invention relates to a transparent polyamide composition which is characterized in that it contains up to 50 parts by weight, can obtain desired flexibility without impairing transparency, and is inexpensive.

The transparent polyamide referred to in the present invention includes lauryllactam,
12-aminododecanoic acid or 11-aminoundecanoic acid and bis(4-aminocyclohexyl)methane are essential monomer components, and a cyclic compound is obtained by copolymerizing monoemers such as isophthalic acid, terephthalic acid, and isophorone diamine. A polyamide resin containing a compound with excellent rigidity, heat resistance, and transparency. Specifically, the one disclosed in Japanese Unexamined Patent Publication No. 56-45924 can be used.

Polyamide 12 referred to in the present invention is a homopolymer obtained by polymerizing lauryllactam and/or 12-aminoundecanoic acid, and polyamide 11 is a homopolymer obtained by polymerizing 11-aminoundecanoic acid.

The combination of nylon 11 series and nylon 12 series is preferred.

When nylon 12 or nylon 11 is blended with transparent polyamide, the amount of nylon 12 or nylon 11 is 5 to 50 parts by weight, preferably 5 to 30 parts by weight, based on 100 parts by weight of the transparent polyamide. If the amount of nylon 12 or nylon 11 is less than 5 parts by weight, the softening effect will not be sufficient (and if it is more than 50 parts by weight, transparency will be significantly impaired.

There are no particular restrictions on the method of kneading and blending nylon 12 and nylon 11 into the transparent polyamide (although any known blending method may be employed, but the triblended resin may also be injection molded as it is.

A fixed time or pigment may be added.

Next, the present invention will be explained using examples.

Example 1 35 parts by weight of lauryl lactam, 19 parts by weight of bis(4-aminocyclohexyl)methane, 15 parts by weight of inphorondiamine
IO parts by weight of nylon 12 homopolymer were mixed and kneaded with 100 parts by weight of a transparent polyamide obtained by copolymerizing 30 parts by weight of isophthalic acid, and 1"X q // X 5
Example 2 25 parts by weight of nylon 12 homopolymer was blended with 100 parts by weight of the transparent polyamide in Example 1, and a bending test piece was molded and the transparency and flexural modulus were measured. A similar test was conducted.

Example 3 50 parts by weight of nylon 12 homopolymer was blended with 100 parts by weight of the transparent polyamide in Example 1, and the same test as in Example 1 was conducted.

Comparative Example 1 A test similar to that of Example 1 was conducted using only the transparent polyamide of Example 1.

Comparative Example 2 100 parts by weight of the transparent polyamide in Example 1 was blended with 20 parts by weight of butylbenzenesulfonamide, a plasticizer for nylon.

The above results are shown in Table 1.

Table 1

Claims (1)

[Claims] 5 to 50 parts by weight of polyamide 12 or polyamide 11 to 100 parts by weight of a transparent polyamide containing a cyclic compound containing lauryllactam, 12-aminododecanoic acid or 11-aminoundecanoic acid, and bis(4-aminocyclohexyl)methane as essential monomer components. 1. A transparent polyamide composition characterized by a transparent polyamide composition.