JPS5845244A - Polyolefin sheet for decorative sheet - Google Patents

Abstract

PURPOSE:The titled sheet useful as a packing article slightly causing the whitening of ruling of processing at normal temperature, having improved welding properties at low temperature, obtained by adding a polyethylene having a fixed density and a propylene homopolymer to a propylene-ethylene random copolymer. CONSTITUTION:(A) 30-80wt% propylene-ethylene random copolymer (preferably having a melt flow index of 0.3-10g/10min) having an ethylene content of <=10wt%, preferably 2-5wt%, is blended with (B) 10-50wt% polyethylene (preferably MI of 0.2-5g/10min) having a density of >=0.94g/cc and (C) 0-40wt% propylene homopolymer (preferably MI of 0.3-10g/10min) under heating. Ruling processing is carried out by using a type obtained by integrating a Thomson blade and a ruling blade to a veneer, and a sheet is pressed by pressure per length of ruling blade of 0.1-2ton/cm by a common machine press.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention is directed to the whitening phenomenon (hereinafter abbreviated as "folding whitening") that occurs on the hinge during bending after vertical processing in the hinge.
The present invention relates to a polyolefin yarn sheet for decorative laminates which has extremely low weldability and only has good weldability.

Polypropylene (a homopolymer of glopylene and a comonomer with a small amount of ethylene) sheets have good hinge properties, so they are suitable for stationery items that require cosmetic properties such as hard cases such as file cases and letter files. It has come to be used in packaging supplies for electronic products.

The performance of the platform used for these purposes is as follows: (υ) It must have rigidity and impact resistance above a certain level, (2) It must have hinge properties, and it must not impair its cosmetic appearance due to whitening of the lines, etc. (3) Good weldability using KL such as ultrasonic waves or hot air is recommended.

However, WCfC pyrone homopolymer (hereinafter abbreviated as homo-PP) has steep impact resistance (especially at low temperatures), and globylene ethylene random copolymer (hereinafter abbreviated as random PP) has low rigidity. Therefore, Izuko was unsuitable for the above applications.Furthermore, 10 pyrene ethylene! lock copolymer (hereinafter abbreviated as block PP) has a good balance of rigidity and impact resistance, but the l#-edge becomes white. Product 1III1 wax is easily degraded.

A method of heating to 0 to 160° C. and applying wIIW2Ii processing (hereinafter referred to as hot bed edge processing) to prevent bedclothes from whitening (usually 1 ton) was adopted.

However, in this f6 creasing process, there is a difference in heat rate between the steel wire creasing blade and the base plywood.
When the blade and punching blade (Thomson blade) are assembled into -4! ! A gap is created at the threshold when the temperature rises and falls, and the polyglobulin sheet processed with a high-temperature roller blade contracts when cooled. Therefore, it is essential to perform the creasing process and the punching process separately, and as a result of (7), there is a problem in that the positioning of the neck root is difficult, and the dimensional accuracy is reduced due to the positioning n etc. was there.

On the other hand, the crease processing in Tomi-hen is generally done by simultaneously incorporating a copper crease blade with a thickness of 0, 2, 10 to 10 mm on the cutting edge of a semicircular cedar cross section, a commercially available Thomson blade, and a single piece of veneer into a temporary base. By using a combination blade type rz and pressing it against the cortt sheet, there is no deviation between punching and scoring, and a highly accurate bright line processed product can be obtained.

Sheets that undergo room-temperature longitudinal edge processing are in high demand in the market in terms of rigidity and impact resistance, and are made of materials that do not cause line whitening.
However, this polypropylene sheet has not been found so far.

In addition, for products for the above-mentioned purposes, it is necessary to overlap and join the sheets by welding such as ultrasonic welding or hot air welding after bending the feed wire. Moreover, it is required that each joint be done uniformly and without damaging the appearance after the ship is assembled.
However, in the case of ultrasonic waves or hot air 1@-Iwao, if the S* degree is too high, marks caused by contact with heat jigs such as horns and anvils may cause problems in appearance. J, !: Natsu7tff slightly concave s'g1: It is preferable that welding is possible at as low a temperature as possible in order to cause the welding to occur.

The purpose of the present invention is to provide a decorative board that has minimal whitening of beveled edges due to rich temperature ruled edge processing due to its sheet shape, has good low temperature weldability, and has excellent mechanical properties such as rigidity and I1II\S resistance. The purpose is to provide polyolefin 7-ate.

According to misfire #1, (4) ethylene content is lυ1% by mass
Allobile/ethylene random copolymer 3 under JE
0 to 801 amount (C)
Lopylene homopolymer 〇-40 resin composition with 19 fins extruded into a foot shape #: Provides a polyolefin sheet for board suspension.

In the present invention, the nolopyrene ethylene random copolymer (abbreviated as 14F random PP) of component A is 4L, i
t-form (from mixture of ethylene and 10-pyrene J) k
It is a large amount that can be obtained by performing a multi-stage synthesis by changing the supply ratio of the monomer mixture and the pre-electrification of propylene and the monomer mixture. Including our t.

Ethylene content is 10111% or less, preferably 2 to S
A heavy weight copolymer is used.

If the ethylene content is more than 10 times the rigidity, the rigidity will drop considerably, making it suitable for use in letter files and hard cases.
It's inappropriate.

In random ppom manufacturing, a multi-stage polymerization method is adopted because the physical property balance is the same as above.

In the polymerization fR floor, the ethylene/propylene monomer ratio is 3
A-1/30: A rubbery substance (hereinafter abbreviated as rubber)
is generated. If the random PP contains a rubbery substance, the rigidity and impact balance will be good. - But this rubber 3! If the content of [[] increases, the tendency to become more noticeable is due to the appearance of wrinkles, so it is preferable that the content of the rubbery substance in the resin composition is 53% or less.

Random P with desirable physical properties for use in unexploded fJiJ
P prepolymerizes Norobire/monomer, and ethylene mixture is 1
In addition, polymerization of a mixed gas of nolopyrene/ethylene of less than 0.01% is obtained.

Chitomo, B component polyethylene/(hereinafter abbreviated as PE)
is a copolymer of ethylene homopolymer with α-olefin such as propylene and butene (as a result of co-merging with α-olefin, all methyl groups are 1aI).
iL is 0-30 M/1000 Q)%). Mayu, secret 1L is used for more than 941/ec.

If f is less than 0.94, the rigidity will be low and the desired 7-t'kll cannot be achieved.

In addition, random PP of A component and homogeneous P of C2414
The melt index of P (hereinafter abbreviated as Ml) is %
IL limited to 0.3~10 t710 Ni&
It is preferable that Seven n is Ml is 0.3 t
/10- Mixed with other Lennons at the end of the day! It has poor properties and low extrusion processability. -10,000, 10 f/1011i1
If the temperature exceeds K, the sag during extrusion will be noticeable, the sorting performance will be poor, and the impact resistance of the product will be reduced.
It is preferable that the strength of the PE of the yellow component is α2-5 f/1G- due to the same salt.

The blending ratio of the above 31/M resin is a random P of the component.
P is 30-80 weight whispers, good fin is 35-75 weight whispers;
PL of l fin is 10-40] [jill preferably #i1
5 to 35 weight ZS; C component homo PP is 0 to 40 weight 1
sGood case or o ~5slJlsoi[l'hru.

If the blending ratio of the random PP component is less than 30%, the anti-whitening effect will be insufficient, while if it exceeds 5%, the rigidity will be insufficient. The blending ratio for 1tIIt is 1 (111:
ii@full has insufficient fill resistance, -40% tcL
When welded, the weld strength tends to be weakened, and the bending resistance of the weld is also reduced.

If the blending amount of homo-PP (C component) exceeds 4Of11, the impact resistance will decrease, and furthermore, the welding strength will be weak under general conditions when using commercially available aSS Iso from ultrasonic waves or hot air. There is a tendency to

Pigments, various stabilizers, anti-tepidonic agents, etc. can be added to the above θmm lead composition according to conventional methods.

In addition, thermal blowing agents (such as azodicaramide, nonitronopentamethylenetetracine, and azobisin butyronitrile) and blowing aids (such as urea, zinc oxide, ste, zinc arinate, etc.) % can be added to form a foamed sheet.

! 1 component is usually heated and mixed in an extruder and then used in a die such as a T-die or circular die! 7. After extrusion, the sheet is cooled by roll cooling or air cooling. The method is not limited to conventional artefacts.

Creased line processing method Fi Toki's L5 Tomnoa blade and custom thin blade [Using a mold built into a single plywood board, the long blade is cut into a sheet using a regular all-machine press (Guybres, Victoria, etc.) or hydraulic Luss, etc. This can be done by pressing with the force of αl-1t/V-IIiho.The sheet according to the present invention is suitable for use with hard cases, letter files, etc., which can be used as presentation cases. 19 for vertical and simultaneous machining at room temperature
A shape with good dimensional stability can be easily obtained.

It is desirable that Wc welding of sheets for decorative laminates can be carried out using a general commercially available welding machine that uses ultrasonic #1 welding or hot air welding. Ultrasonic #I contact is a method in which the superimposed sheets are pressed by a t-horn and an anvil to generate ultrasonic oscillation, and the joining flesh of the sheets is softened by heat generated by local vibration 11111, and is then bonded. We are proceeding with studies with the goal of preventing whitening. Some of the obtained sheets have poor low-temperature melting properties and too high thermal conductivity. Due to the occurrence of dents, the appearance was impaired by TTF', but in the case of the sheet according to the present invention, this same point % has been eliminated, and commercially available super transliteration melt! Sufficient 1W contact strength can be obtained with II steel without damage caused by class #.

In addition, hot air S contact uses hot air of 250°C to 500°C to reduce the amount of wind waves.
This is a method in which the bonded portion of the sheet is passed through a hot air blowing section to soften it, and then is pressed and bonded. Even in this method, the sheet according to the present invention could easily obtain a sufficient adhesion strength without damage.

Note that the physical property values of *m4P4 are measured in accordance with the following method.

72 Ll of infrared absorption spectrum for ethylene-containing JI:FVS molded film in PP random co-constitution.
, 726 t 730cxx-' are measured and L is calculated using the usual method.

Regarding the methyl group at nigerless molded film, the infrared absorption spectrum of methyl violet and the absorption of 1378tx -'' by sea bream and the methylene group 1369°1353a* - which overlaps with fLK.
The absorption of ' is measured and calculated using a conventional method.

1 direct summer: M8? M D-12: Measure according to 18-62T.

Tune is elastic *: JIB-72 for 6X thick breath molded sheet
Measure according to 03.

Destruction impact strength: Measured using a DuPont impact tester manufactured by Toyo Seiki Co., Ltd. on a sheet having a thickness of α8%.

Curvature of the tip! Using a 1/2 inch P diameter striking core, 23℃
It is expressed as the non-destructive-destructive energy value at .

EXAMPLES The present invention will be specifically explained in Examples and Comparative Examples below.

Example 1 Ml is 1.5? /10− homo PP030 coulometric part and MI are L 5? /10- and the ethylene content is 4
Random PP C10 pyrene is mixed with ethylene and the ethylene mixing ratio is 631JI%! Manufactured by ShiKIIL in Robyrene mixed gas (7t-) Ndam PPJ's 40T Dobe and @Nao are α96 t/ce and MI is α3
f/1t)-, 1m of black pigment (t16) was added to an am composition consisting of 30% IILs of pg, and the mixture was sufficiently stirred in a Henschel mixer to obtain a mixture with a mouth price of 40cm.
Using an extruder with φ and L/D of 22, extrude the cylinder with the maximum A size [heated at 220°C to obtain a lip length of 150°C, and mold it while cooling with a take-up roll. A sheet fungle with a thickness of α8■@120■ was produced.

The physical properties of this sheet are as shown in the table below, and the elasticity is 8,000/- and the impact strength of R Yubon, which is a guideline for market demand for use in cosmetic cases, letter files, etc. It was t to clear the numerical value of 15 to 2u edge/1 by the amount of light.

? At g-, the tip shape is a meridional shape with a thickness of α8 points mk%
Using a commercially available snoring blade, attach it to a hydraulic guipress.9
, the borders of this sheet! l processing was performed. The Kw4 was adjusted so that the hinge thickness after processing was α2■. When folded along the ruled lines, almost no whitening occurred and the result was good.

In the folding test of repeated folding of the ruler Iis - If#CL, five test pieces #IC were bent and cut 10,000 times, and no cracking occurred.

C) 1-A welding test was conducted using a supersonic welding machine. The anvil has a tip shape of 15-φXIO point.
(Dktl was used. The amplitude was 50 μ, the pressing force was 5 (-1), the oscillation time was 0.3 seconds, the joint peeling was 11 [1] per 2 points, and it was practically as strong as light, and only % welding The horn (smooth surface) of the part was less than Il, and there was no loss of commercial value in terms of appearance.

Comparison Ga 1 - Resin composition: 75 parts by weight of glopylene ethylene block comelymer with kMI of L 5 tAO- and ethylene content of 8, with density of α96f/cc and MI of (L
The weight of 25 parts by weight of Pie, which is 3 t710sk, is the same as in Example 1.

A similar test was performed on the obtained rt
~45-・country, showing a good balance of physical properties.

However, when this sheet was subjected to ruled line processing at room temperature, the ruled lines turned white when FFR was bent.
7t has an unsightly appearance.

Examples 2 to 6 and Comparative Examples 2 to 6 In addition to changing the components and composition ratios of homo PP, random PP, and PE as shown in Tables 1 and 2, sample samples were produced and evaluated using Example 1 and Meat-like. Ta. Table 3 shows the approximate quality of each component.

Composition ratio t of each component *Example 2 changed within the scope of the invention
- 4 have physical properties such as rigidity and impact strength that are well-balanced without causing any practical problems. Compared to this t'LIζ, the ratio of homo PP alone is 1! ? σ impact strength and weld r at lI2
There is a problem, and the specific TIR example 3, which uses random PP, not only has low rigidity, but also has only one hand in terms of impact strength.

In addition, in Comparative Example 4, which is a half-and-half blend of both, Comparative Example 2L
Although the balance of physical properties has been improved, the impact strength is insufficient.

On the other hand, in Comparative Example 5, which is a 50/50 blend of random PP and PK, the impact strength is relatively good due to the large amount of PE, but the bending strength tends to be weak and the weldability is poor. Comparative Example 6, which uses 40 parts of homo-PP and 20 parts of APP and 4 parts of pg, has poor weldability and noticeable whitening.

In the case of using random PPK ethylene containing V half 8% fi5, a slight decrease in rigidity was observed and there was no practical problem with n1, but when using random PPk with an ethylene content of more than 10 tons (comparison 9117J, Rigidity decreases significantly. In Example 6 using pE with a density of 0.95 f/ce, there is no problem in practical use, but a decrease in rigidity is observed. On the other hand, the density is α93 t/ce Q) % (Comparative Example 8), the rigidity significantly decreases and is inappropriate.

Procedural amendment dated IQ 13, 1980 Director General of the Japan Patent Office Shima 1) Tono Haruki 1 Indication special of the case - No. 143925/1982 2 Name of the invention I lyolefin sheet for decorative laminates 3 Person making the amendment Relationship to the case Patent Applicant Name (312) Mitsui Toatsu Kagaku Taste Co., Ltd. 4 Agent Address 5 Toranomon Electric Building, 2-8-1 Toranomon, Minato-ku, Tokyo Target of Amendment: Claims and details of the invention Explanation column 6,
Contents of amendment ill % The scope of claims is amended as shown in the attached sheet.

(2) Meisho, page 5, line 9 (n r 40 [setting% J k
Corrected to ``r50fii1%''.

, 311 Tsukasa, page 6 F, 2 lines of "mixing" are replaced with "mixing ratio"
Revised IE f.

(4) "35-75% polymorphism" on page 8, line 5 of the same page is r40-
? -75marog%JK%+1flfji6 line f) r 40
璽會%・・・・・・35 璽會%l'r50tt% (preferably 15-41)% by weight"
0% Jltr 50%”.

” (6) “Examples 2 to 6 and Comparative Example 2” in line 8 of 15Ii
to 6" is corrected to ``Examples 2 to 8 and Comparative Examples 2 to 8.''

+71 1?71id1.16 page 4 line f) r half k
Jvr 40:6゜weight 1%" and corrected to %@'I tribute 8th line "240 copies..., PE40 JlkprP 3
04 and 5yf PP10 part and PE 60 J, and in the last line of 16, after "It is inappropriate.", "Furthermore, a preferred blend example of the three of random PP, PK, and homo PP Example 71tI Example 1, 2.3.5.6, 7.)l
It was shown to. ” Insert.

J Ff No. 17g Tables 1 and 2 have been revised as follows:
do: #! Scope of claims

Claims (1)

[Claims] (4) Propylene/ethylene random copolymer 30-80% by weight with an ethylene content of 1031 or less; (6) Borie, ethylene 1O-40xii% with a density of α9497ce or more; and (C) f O pyrene homo? Rimmer〇~401ts and 41 fat group IiL item t
Liolefin sheet is extruded into a G-shaped decorative board.