JP3140847B2 - Propylene resin laminated foam sheet for molding - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a propylene-based resin laminated foam sheet for molding which is suitable for molding a container, particularly for forming a deep drawing container.

[0002]

2. Description of the Related Art As a method for producing a foamed sheet for forming a container or the like, an extrusion foaming method in which a thermoplastic resin is melt-kneaded with a foaming agent in an extruder and then extruded under low pressure to foam is widely used. Have been.

In the extrusion foaming method of an olefin resin, when a melt-kneaded product of a resin and a foaming agent is extruded under a low pressure from an extruder, foaming is performed by expanding the foaming agent in the melt-kneaded material. However, if the temperature of the resin is increased, the viscosity drops sharply, the resin cannot retain the foaming agent, and escapes from the resin to form an open-cell foam sheet.On the contrary, the resin temperature is increased to increase the viscosity of the resin. If the temperature is lowered, the crystallization of the resin proceeds, and as a result, the foam is not sufficiently and uniformly foamed, and the surface of the foam sheet becomes uneven. For this reason, extrusion foaming needs to be performed at a temperature at which the resin has sufficient viscoelasticity so that a sufficiently uniform foaming can be performed and a foaming agent can be held in the resin. The temperature range in which viscoelasticity suitable for foaming is obtained differs depending on the type of resin, and this temperature range is generally referred to as a foaming suitable temperature range.

[0004]

However, the propylene-based resin having a higher crystallinity than low-density polyethylene or the like has a very narrow viscoelasticity of the resin due to a slight temperature change, and has a very narrow temperature range suitable for foaming. It is very difficult to carry out extrusion foaming while maintaining the resin temperature within such a narrow temperature range, and when the extrusion foaming temperature fluctuates and deviates from the suitable foaming temperature range, the foamed portion has an open-cell structure. And the surface became uneven, and it was difficult to obtain a foamed sheet having good overall and uniform properties. Conventionally, in the case of a non-crosslinked propylene-based resin, a relatively good foamed sheet can be obtained only at a low expansion ratio of a density exceeding 0.2 g / cm ³ or at a density of 0.013 g / cm ^3. It has a high expansion ratio of less than.

[0005] The above-mentioned problems are considered to be caused by the high crystallinity of the propylene-based resin, and the density of the propylene-based resin is not higher than 0.
The reason why a foam sheet having a low expansion ratio of more than 2 g / cm ³ can be obtained relatively favorably is that the resin temperature during extrusion foaming is higher than the crystallization temperature of the resin because the ratio of the resin is larger than the amount of the foaming agent. Is also considered to be due to the fact that it can be set to a considerably higher temperature. The density is 0.013 g / cm ³
The reason why a foamed sheet having a high expansion ratio of less than 1 can be obtained relatively favorably is as follows.

In general, a foaming olefin-based resin in the process of extrusion foaming is subjected to a cooling operation from the outside by using a cooling means, thereby solidifying the cell walls to obtain a good foamed sheet. However, since the propylene-based resin has a higher degree of crystallinity than low-density polyethylene, the calorific value during crystallization is large. This heat hinders the cooling and thus the solidification of the cell walls, and breaks or deforms the cells of the propylene-based resin in the process of foaming.

Therefore, by foaming a large amount of a foaming agent, the temperature of the propylene-based resin in the course of foaming is rapidly lowered by utilizing the heat of vaporization (heat of expansion) of the foaming agent, thereby solidifying the cell wall. Promote. Further, a large amount of the foaming agent has a function of delaying crystallization of the resin in the extruder. As a result, a relatively good foam sheet can be obtained. However, in this case, the foamed sheet to be obtained necessarily has a high expansion ratio of less than 0.013 g / cm ³ due to the necessity of blending a large amount of a foaming agent. Also in this case, the suitable foaming temperature range is only about 0.6 ° C.

[0008] The present inventors have conventionally used propylene resin,
In view of the fact that only an extruded foam sheet having a high expansion ratio or a low expansion ratio can be obtained, the density is 0.3 to 0.3 by using a propylene resin having a specific drawdown property.
In addition to finding a method that can easily produce even a propylene-based resin extruded foam sheet of 06 g / cm ³ , the skin thickness, the thickness of air bubbles, and the number of cell membranes in the thickness direction of the foam sheet having a specific thickness have a specific relationship. (Japanese Patent Application No. Hei.
No. 72876).

This foamed sheet is excellent in heat resistance, water resistance, chemical resistance, heat insulation, shape retention, rigidity, etc., and is therefore used, for example, for directly heating food in a microwave oven while containing food. It is suitable for molding food containers for microwave ovens. Also, since this foam sheet is excellent in deep drawing formability, even when a container having a deep bottom is formed, the container becomes extremely thin partially (particularly at a boundary portion between the bottom and the side wall) and a hole is formed. Although it is an excellent thing that does not have the risk of being drawn, the deep drawability is not always satisfactory,
Multi-cavity deep drawing has problems in forming both ends, and there is a limit in satisfying the demands of severer deep drawing and complicated molding.

[0010] The present invention has been made in view of the above points,
It is an object of the present invention to provide a propylene-based resin laminated foamed sheet for molding, which is an improvement of the prior application of the present applicant and enables more favorable deep drawing.

[0011]

That is, the laminated foamed propylene-based resin sheet of the present invention has a long-chain branch and a draw-down property of not more than 60 m / min. 1 ~ 10mm, density 0.06g
/ Cm ³ or more and less than 0.3 g / cm ³ , and a thickness of 5 to 500 μm laminated on at least one surface of the foam sheet.
m of a propylene-based resin film.

In the propylene-based resin laminated foam sheet for molding of the present invention, at least one of the base resin of the foamed sheet and the base resin of the film laminated on the foamed sheet contains 0.5 to 30% by weight of an ethylene component. It is preferable that the propylene resin is contained.

As shown in FIG. 1, a foamed propylene resin sheet 1 of the present invention comprises a foamed propylene resin sheet 2 and a propylene resin film 3 laminated on at least one surface of the foamed sheet 2. Become.

In the present invention, a non-crosslinked propylene resin having a long chain branch and a drawdown property of 60 m / min or less is used as the propylene resin as the base resin of the foamed sheet 2. The drawdown property is preferably 3
0 m / min or less, particularly preferably 15 m / min or less.

The drawdown property means that a molten propylene resin heated to 230 ° C. is extruded in a string form at a constant speed of 10 mm / minute from a melt indexer nozzle (2.095 mm in diameter, 8 mm in length), and then extruded. After passing the string-like object through a feed roll located above a tension detection pulley located below the nozzle, the winding speed of the take-up roll is gradually increased while winding by a take-up roll. It refers to the speed at which the string is wound and the string is wound.

The above resin may be any of a homopolymer, a block copolymer and a random copolymer, but the copolymer is preferred because of its excellent deep drawability.

The propylene-based resin constituting the foamed sheet 2 must have a long-chain branch in the main chain, unlike ordinary propylene-based resins. The propylene-based resin may be any of a homopolymer, a block copolymer, and a random copolymer, but is preferably a block copolymer in view of the ease of forming long-chain branches, and particularly preferably a propylene-ethylene block copolymer. Polymers are preferred.

In the case of the copolymer, a copolymer of propylene and a small amount of an olefin other than propylene is preferable. Examples of the olefin include ethylene and α-olefins having 4 to 10 carbon atoms. Two or more kinds can be used in combination. Examples of the α-olefin having 4 to 10 carbon atoms include 1-butene, isobutylene, 1-pentene, 3-methyl-1-butene, 1-hexene, 4-methyl-1-pentene, and 3,4-dimethyl-1-
Butene, 1-heptene, 3-methyl-1-hexene and the like.

The above olefin is usually contained in the copolymer in an amount of 0.5.
It is preferably contained in an amount of from 30 to 30% by weight, especially from 1 to 10% by weight.

The propylene resin used in the present invention is:
A resin which is a normal crystalline linear propylene resin (usually a weight average molecular weight of 100,000 or more) and further contains an atactic component and / or a component which is isotactic but not crystallized (hereinafter, the present invention) In order to distinguish the resin from the propylene resin used in the above, this resin is referred to as “normal propylene resin.” When simply referred to as a propylene resin, it means the resin used in the present invention.)
Decomposition type (decomposition temperature: room temperature to about 120 ° C)
And heating the mixture to 120 ° C. or lower to bond an atactic or / and non-crystallized isotactic component as a branched chain to the main chain of a normal propylene-based resin. Usually, it is considered to have a branched structure having a long-chain branch mainly at an end.

The low-temperature decomposable peroxides include di (s-butyl) peroxydicarbonate and bis (2-
Ethoxy) peroxydicarbonate, dicyclohexylperoxydicarbonate, di-n-propylperoxydicarbonate, di-n-butylperoxydicarbonate, diisopropylperoxydicarbonate,
Examples thereof include t-butyl peroxy neodecanoate, t-amyl peroxy neodecanoate, t-butyl peroxy pivalate, and the like.

It has a long-chain branch and a draw-down property of 6
A propylene-based resin having a flow rate of 0 m / min or less is replaced with an inert gas such as argon while the ordinary propylene-based resin is stirred in a reactor equipped with a stirrer. Usually, 5 to 50 mmol per 1 kg is added, and the mixture is heated and reacted to about 120 ° C., preferably about 70 to 105 ° C. while continuing stirring (usually 30 to
120 minutes), after which the reaction is stopped.
In terminating the reaction, a method of introducing a reaction terminator such as methyl mercaptan into the reaction vessel, or heating the reaction product to about 130 to 150 ° C. for 20 to 40 minutes is employed. Long chain branching in propylene resin molecular chain
Can be checked by the following method.
You. That is, an elongational flow measuring device (for example, rheometric
Suspension Flow Measuring Equipment: trade name RR-9000)
Use this to prepare a measurement sample from propylene-based resin
Elongational viscosity of sample at strain rate (sec- ¹ )
The relationship between (poise) and time (seconds) is graphed.
On this graph, the propylene-based
Resin and propylene-based resin having no long-chain branch are long-chain
Branched propylene-based resin has a low elongational viscosity curve.
Does not have long chain branches, while growing over time
The slope of the elongational viscosity curve of propylene-based resin
Can be distinguished from each other. Leo above
Metrics Elongational Flow Measurement System (RER-900
0) shows that the propylene having a long chain branch
Of resin-based resin and propylene-based resin without long chain branch
Figure shows the relationship between elongational viscosity and time at the speed
3 is a graph. Curve A in the graph has a long chain branch
Curve B has no long chain branch.
Propylene resin. According to this graph,
In the propylene-based resin having
Does not have long chain branches, while growing over time
For propylene-based resins, the slope of the elongational viscosity curve varies with time.
It can be seen that it becomes smaller. The measurement sample and measurement
The fixed conditions are as follows. -Size and shape of measurement sample: length 30mm, diameter 5
mm , strain rate: 1.0 second- ^1. Measurement temperature: melting point of base resin + 20 ° C (however, melting point is based on
1-5 mg of material resin was measured at 10 ° C./min by a differential scanning calorimeter.
Of the endothermic peak of the DSC curve obtained when the temperature is raised in step
Temperature. )

The drawdown property can be adjusted by the number and length of the long-chain branches. Generally speaking, this value tends to decrease as the number of long-chain branches increases and the length of the branches increases. Therefore, in order to obtain a desired drawdown copolymer, it is necessary to set reaction conditions in consideration of these factors.

In the case of having no long-chain branch, or having a short or too short branch, or a usual propylene-based resin, the drawdown property exceeds 60 m / min. Such performing extrusion foaming using conventional propylene resin, similar density 0.06 g / cm ³ or more and a foam sheet 2, even an attempt to obtain a foamed sheet of less than 0.3 g / cm ^3, obtained The resulting foamed sheet has many corrugations and surface irregularities, and has no commercial value.

The propylene-based resin used in the present invention has a half-crystallization time of preferably at least 800 seconds, more preferably at least 1000 seconds, at a crystallization temperature of + 15 ° C. For the measurement of the half-crystallization time, a crystallization rate measuring device can be used.

In order to measure the half-crystallization rate, first, the support holding the film-like sample is put into an air bath of a crystallization rate measuring device to completely melt the sample, and then the molten sample is put together with the support. The sample is immersed in an oil bath maintained at the crystallization temperature of the sample + 15 ° C so as to block the optical path between the light source and the optical sensor, and is always kept at the optical sensor until the melted sample solidifies again. The voltage of the light source is adjusted so that the amount of light is detected, and a voltage-time curve as shown in FIG. 2 is obtained. In this case the voltage when the voltage at the curve becomes a constant value and the V _0, and the time until the voltage becomes 1 / 2V ₀ a half-crystallization time.

In the present invention, not only the above-mentioned propylene resin can be used alone, but also other resins can be mixed and used. As the resin used in combination, for example, a propylene-based resin other than the above, or high-density polyethylene, low-density polyethylene, linear low-density polyethylene,
Ethylene resins such as linear ultra-low density polyethylene, ethylene-butene copolymer, ethylene-maleic anhydride copolymer, butene resins, polyvinyl chloride, vinyl chloride such as vinyl chloride-vinyl acetate copolymer Resins, styrene resins and the like.

When the other resin is mixed, the amount of the resin to be mixed is limited to 40% by weight of the total weight of the polymer after mixing, and the drawdown property of the mixture does not exceed 60 m / min. There is a need.

On the other hand, as the propylene-based resin which is the base resin of the film 3 laminated on the foamed sheet 2, in addition to the same resin as the propylene-based resin constituting the foamed sheet 2, a conventionally used propylene-based resin is used. A general propylene-based resin can be used. The propylene resin may be either a propylene homopolymer or a copolymer with a monomer having an unsaturated bond copolymerizable with propylene. In the case of a copolymer, a block copolymer or a random copolymer is used. Any of Examples of the monomer having an unsaturated bond copolymerizable with propylene include ethylene and α-olefins having 4 to 10 carbon atoms, and these can be used alone or in combination of two or more. Examples of the α-olefin having 1 to 10 carbon atoms include 1-butene, isobutylene, 1-pentene, 3-methyl-1-butene, 1-hexene, 4-methyl-1-pentene, and 3,4-dimethyl-1 -Butene, 3-methyl-1-hexene and the like.

In the laminated foamed sheet 1 of the present invention, at least one of the foamed sheet 2 and the film 3 is made of a propylene resin having an ethylene content of 0.5 to 30% by weight. The flexibility as a whole is increased, there is no sagging of the sheet at the time of heat molding, and the moldability is particularly good, which is preferable.

The propylene resin having an ethylene component content of 0.5 to 30% by weight may be a mixture of polyethylene and polypropylene alone or a copolymer in which the ethylene component is copolymerized with the propylene component. In the case of a copolymer, it may be a block copolymer or a random copolymer, but a block copolymer is preferred.

In the laminated foamed sheet 1 of the present invention, the propylene-based resin constituting the foamed sheet 2 and the propylene-based resin constituting the film 3 are preferably the same type of resin. That is, when the propylene resin constituting the foam sheet 2 is a propylene homopolymer, the propylene resin constituting the film 3 is also preferably a propylene homopolymer, and the propylene resin constituting the foam sheet 2 is preferably a propylene homopolymer. In the case of a copolymer, for example, in the case of a propylene-ethylene block copolymer or a propylene-ethylene random copolymer, the propylene-based resin constituting the film 3 is also a propylene-ethylene block copolymer, a propylene-ethylene It is preferably a random copolymer.

The most preferable combination of the resin constituting the foamed sheet 2 and the resin constituting the film 3 is a combination of propylene-ethylene block copolymers or a combination of propylene-ethylene random copolymers. . It is preferable that the resin constituting the foamed sheet 2 and the resin constituting the film 3 are composed of the same resin, since the laminated sheet and the container obtained from the laminated sheet can be recycled.

Even when the propylene resin constituting the foam sheet 2 and the propylene resin constituting the film 3 are the same type of propylene resin, the resin constituting the film 3 has a long chain branch and 60 drawdown
It does not have to be a propylene-based resin of m / min or less.

In the laminated foam sheet 1 of the present invention, the thickness of the foam sheet 2 is 1 to 10 mm, preferably 1 to 5 mm, and the density and the density are 0.06 g / cm ³ or more and less than 0.3 g / cm ³ , preferably is 0.09 g / cm ³ or more and less than 0.3 g / cm ^3. The thickness of the film 3 is 5 to 500 μm, preferably 30 to 150 μm. The thickness of the foam sheet 2 is 5mm
If it exceeds, uniform heating during molding is difficult, which adversely affects moldability. When the density is 0.3 g / cm ³ or more, the flexibility is low, and when the density is less than 0.06 g / cm ³ , the molded product obtained from the laminated sheet 1 is used for, for example, fish meat packaged with a wrap film. A tray or the like lacks shape retention and rigidity. If the thickness of the film 3 exceeds 500 μm, lamination of the film 3 becomes difficult, and there is a problem in manufacturing efficiency.

As a method for laminating the foamed sheet 2 and the film 3, a general method such as an extrusion lamination method (extrusion lamination), a thermal lamination method (heat lamination), lamination using a hot melt adhesive or the like may be employed. Can be.

As a method for obtaining the foamed sheet 2 used in the present invention, a foaming agent and a non-crosslinked propylene-based resin having long-chain branching and having a drawdown property of 60 m / min or less are melt-kneaded in an extruder. Using a circular die having an annular lip attached to the melt extruder at the extruder tip, extrusion foaming is performed from the lip of this die to obtain a tubular foam, and then the tube is cut open to form a sheet. Usually adopted.

In producing the foamed sheet 2, as a foaming agent, an inorganic foaming agent, a volatile foaming agent, a decomposable foaming agent, or the like can be used. Examples of the inorganic foaming agent include carbon dioxide, air, and nitrogen.

Examples of the volatile foaming agent include aliphatic hydrocarbons such as propane, n-butane, i-butane, pentane and hexane, cycloaliphatic hydrocarbons such as cyclobutane and cyclopentane, trichlorofluoromethane and dichlorodifluoromethane. , Dichlorotetrafluoroethane, methyl chloride,
Halogenated hydrocarbons such as ethyl chloride and methylene chloride are exemplified.

Examples of the decomposition type foaming agent include azodicarbonamide, dinitrosopentamethylenetetramine, azobisisobutyronitrile, sodium bicarbonate and the like. These foaming agents can be appropriately mixed and used.

The amount of the foaming agent varies depending on the type of the foaming agent, the desired expansion ratio, etc., but the density is 0.06 g / cm ^3.
As described above, the amount of the foaming agent used to obtain the foamed sheet 2 of less than 0.3 g / cm ³ is approximately 0.5 to 6 parts by weight (in terms of butane) of a volatile foaming agent per 100 parts by weight of the resin. About 0.2 to 2.5 parts by weight (in terms of carbon dioxide) of the foaming agent, and about 0.1 to 10 parts by weight of the decomposition type foaming agent.

If necessary, a foam adjusting agent can be added to the melt-kneaded product of the resin and the foaming agent when the foamed sheet 2 is manufactured. Examples of the cell regulator include inorganic powders such as talc and silica, acidic salts of polycarboxylic acids, and reaction mixtures of polycarboxylic acids with sodium carbonate or sodium bicarbonate. It is preferable to add the foam control agent in an amount of about 13 parts by weight or less per 100 parts by weight of the resin (except when a large amount of the inorganic filler is contained in the resin). Further, if necessary, additives such as a heat stabilizer, an ultraviolet absorber, an antioxidant, and a colorant can be added.

The resin may contain an inorganic filler up to 40% by weight of the total weight in advance. Examples of the inorganic filler include talc, silica, calcium carbonate, clay, zeolite, alumina, barium sulfate and the like. It is preferable that these particles have an average particle size of 1 to 70 μm. When such an inorganic substance is contained in a large amount, the resulting foamed sheet has improved heat resistance and can reduce calorie burned during incineration.

The method for forming the laminated foamed sheet 1 of the present invention includes vacuum forming, pressure forming, and applications thereof such as free drawing forming, plug and ridge forming, ridge forming, matched mold forming, straight forming, and the like.
Examples include drape molding, reverse draw molding, air slip molding, plug assist molding, plug assist reverse draw molding, and a method combining these.

The laminated foam sheet 1 of the present invention is suitable for molding various containers, but the container obtained by the sheet 1 of the present invention has heat resistance, water resistance, oil resistance, chemical resistance, heat insulation, and insulation. Since it is excellent in shape, rigidity, etc., it is suitable for molding food containers and lunch containers that are cooked or reheated in a microwave oven by utilizing these characteristics.

[0046]

EXAMPLES Hereinafter, the present invention will be described in more detail with reference to examples. In addition, the drawdown property and melt tension of the resin used were measured using a melt indexer in combination with a melt tension tester type II manufactured by Toyo Seiki Seisaku-Sho, Ltd. Co., Ltd. crystallization rate measuring device MK-801 type was used.

The resins used in the examples and comparative examples are as follows.

Base resin for foamed sheet Resin A: Propylene / ethylene block copolymer having long-chain branching (“SD-632” manufactured by Highmont Corporation of the United States: melting point 159.9 ° C., crystallization temperature 130.1 ° C., half) Crystallization time 13
53 seconds, MI = 2.0g / 10min, drawdown 3.1m
/ Min, melt tension 13.0gf)

Resin B: Propylene homopolymer having a long chain branch (“PF-814” manufactured by Highmont Corporation, USA: melting point 15)
9.0 ° C, crystallization temperature 127.4 ° C, half-crystallization time 3220
Sec, MI = 2.2g / 10min, drawdown 3.5m /
Min, melt tension 17.4gf)

Film base resin Resin 1: propylene homopolymer (“E” manufactured by Nippon Petrochemical
120G ”) 90 parts by weight and high-density polyethylene (“ E803 ”manufactured by Nippon Petrochemical Co., density 0.954 g / cm ³ ) 10
Mixture with parts by weight

Resin 2: Propylene-ethylene block copolymer (same resin as resin A)

Resin 3: Propylene homopolymer (“E120G” manufactured by Nippon Petrochemical Co., Ltd.)

Resin 4: propylene homopolymer (the same resin as resin B)

Examples 1 to 9 and Comparative Examples 1 to 3 Foamed sheets and films shown in Table 1 were laminated by the method shown in the same table to obtain laminated foamed sheets. The density of the sheet after film lamination is also shown in Table 1 (the comparative example shows the density of the sheet after lamination only in the example because no film is laminated on the foamed sheet). Using this sheet, a container with an outer shape of a truncated cone having an opening diameter (outer diameter) of 135 mm, a bottom diameter (outer diameter) of 105 mm, and a depth (outer diameter) of 85 mm was formed.

The obtained container was observed for cracks or holes, and the moldability of the laminated sheet was judged according to the following criteria.
The results are shown in Table 1.

A: No cracks or holes were observed, and the elongation was uniform.・ ・ ・: Cracks and holes were not observed, but elongation was uneven. Δ: Holes or cracks having a diameter of less than 10 mm are present at one or two places. ×: A hole with a diameter of 10 mm or more exists or a diameter of 10 mm
There are three or more holes and cracks.

[0057]

[Table 1]

* 1: The “texture” of the foamed sheet is the number of bubbles per 3 mm × 3 mm (9 mm ² ) on the surface of the foamed sheet, and was measured using a microscope.

[0059]

As described above, the laminated foamed sheet for molding of the present invention comprises a propylene-based resin foamed sheet and a propylene-based resin film laminated on the foamed sheet. As a resin,
Since a specific propylene-based resin having a long chain branch and a drawdown property of 60 m / min or less was used, the container obtained by molding the laminated foamed sheet of the present invention has heat resistance, water resistance, oil resistance, and oil resistance. It is excellent in chemical properties and the like, and is excellent in heat insulation, shape retention, rigidity, etc. Moreover, by laminating a film or sheet on a foamed sheet, the rigidity of the whole sheet,
This has the effect of further improving shape retention.

Further, the laminated foamed sheet of the present invention allows deep drawing to be performed by laminating a film or a sheet on the foamed sheet as compared with the case of a foamed sheet alone. However, a container with a beautiful surface can be obtained.

Further, the resin constituting the foamed sheet and / or the resin constituting the film or sheet laminated on the foamed sheet has an ethylene component content of 0.1.
By using 5 to 30% by weight of the propylene-based resin, the flexibility of the sheet as a whole is increased, and there is an effect that the sheet does not sag at the time of heat molding and the moldability is particularly good.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional view of a laminated foam sheet of the present invention.

FIG. 2 is a voltage-time curve obtained by crystallization rate measurement.

FIG. 3 is a graph showing a relationship between elongational viscosity and time at a strain rate of a propylene-based resin having long-chain branches and a propylene-based resin having no long-chain branches.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Propylene resin laminated foam sheet for molding 2 Propylene resin foam sheet 3 Propylene resin film

Continued on the front page (56) References Patent 2898460 (JP, B2) (58) Fields investigated (Int. Cl. ⁷ , DB name) B32B 1/00-35/00 C08J 9/00-9/42

Claims (2)

(57) [Claims] 1. A non-crosslinked propylene resin having a long chain branch and a drawdown property of 60 m / min or less having a thickness of 1 to 10 mm, a density of 0.06 g / cm ³ or more, and 0.3.
A propylene-based resin laminated foam sheet for molding, comprising: a foamed sheet of less than g / cm < ³ >; and a propylene-based resin film having a thickness of 5 to 500 [mu] m laminated on at least one surface of the foamed sheet. 2. The base resin of the foamed sheet or at least one of the base resin of the film laminated on the foamed sheet,
The propylene-based resin laminated foam sheet for molding according to claim 1, which is a propylene-based resin having an ethylene component content of 0.5 to 30% by weight.