Synthetic resins or natural rubbers -- part of the class 520 ser – Synthetic resins – Processes of preparing a desired or intentional composition...
Reexamination Certificate
2000-06-20
2001-08-28
Sanders, Kriellion A. (Department: 1714)
Synthetic resins or natural rubbers -- part of the class 520 ser
Synthetic resins
Processes of preparing a desired or intentional composition...
C524S198000
Reexamination Certificate
active
06281273
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to a method of preparing heating type paving material as well as a composition for heating type paving material to be used for the method. The present invention also relates to a heating type paving material which contains said composition and which is particularly superior peeling resistance between aggregates and bitumen.
2. Description of the Related Art
Bitumen such as asphalt, tar and pitch has been hitherto blended with various aggregates and used in road paving materials and waterproof materials.
Bitumen is, however, incompatible with aggregates, thus it has a property to be peeled off easily from aggregates, which causes such a phenomenon that bitumen is peeled off by an action of water such as rain water.
This phenomenon effects adversely on durability of road paving materials such as asphalt pavement, accompanied with effects of heavy duty transportation vehicles.
In order to solve such problems, for example, there have been proposed a process for adding compounds comprising alkylhydroxyamine to bitumen in Japanese Patent Publication No. Sho 55-38993, a process for using higher aliphatic polyamines and their derivatives in Japanese Examined Patent Publication No. Sho 55-38995, and a process for adding silane compounds to bitumen in Japanese Examined Patent Publication No. Sho 57-51745.
However, any of the conventionally proposed processes is insufficient in its effect, thus there is not yet obtained any practically satisfied bitumen having superior peeling resistance from aggregates under the existing state.
SUMMARY OF THE INVENTION
In view of the above, it is one object of the present invention to provide a new method of preparing a heating type paving material. It is another object of the present invention to provide a composition for heating type paving material to be used for the method. It is further another object of the present invention to provide a heating type paving material (particularly, asphalt paving material) which contains said composition and which has superior peeling resistance between aggregates and bitumen.
The inventors of the present invention have made an intensive study in order to solve the above-mentioned problems, and found an extremely superior additive (present composition) for a peeling resistance effect between bitumen and aggregate. Thus, the present invention has been attained with this finding.
That is, the invention provides a method of preparing a heating type paving material containing various aggregates and bitumen as bases, characterized in that a composition which is a blend of (B) a condensate obtained by reacting 1 mole of polyalkylenepolyamine expressed by the following general formula (A)
H
2
N[(CH
2
)
m
NH]
n
(CH
2
)
m
NH
2
(A)
wherein, m denotes an integer of 2 or 3, and n denotes an integer of 1-8, with from 1 mole to (n+1) moles of a saturated or unsaturated fatty acid having 8-22 carbon atoms and (C) a modified polyolefin resin having carboxyl groups with an acid value of 5-100 in a proportion of (B):(C)≈95:5-5:95 (weight %) is added to bitumen in an amount of 0.05-5.0 weight %.
The invention also provides a composition for heating type paving material, which is a blend of (B) a condensate obtained by reacting 1 mole of polyalkylenepolyamine expressed by the following general formula (A)
H
2
N[(CH
2
)
m
NH]
n
(CH
2
)
m
NH
2
(A)
wherein, m denotes an integer of 2 or 3, and n denotes an integer of 1-8, with from 1 mole to (n+1) moles of a saturated or unsaturated fatty acid having 8-22 carbon atoms and (C) a modified polyolefin resin having carboxyl groups with an acid value of 5-100 in a proportion of (B):(C)=95:5-5.95 (weight %).
Further, the invention provides a heating type paving material comprising (i) various aggregates, (ii) bitumen as bases, and (iii) a composition which is a blend of (B) a condensate obtained by reacting 1 mole of polyalkylenepolyamine expressed by the following general formula (A)
H
2
N[(CH
2
)
m
NH]
n
(CH
2
)
m
NH
2
(A)
wherein, m denotes an integer of 2 or 3, and n denotes an integer of 1-8, with from 1 mole to (n+1) moles of a saturated or unsaturated fatty acid having 8-22 carbon atoms and (C) a modified polyolefin resin having carboxyl groups with an acid value of 5-100 in a proportion of (B):(C)=95:5-5:95 (weight %), wherein, the composition is added to bitumen in an amount of 0.05-5.0 weight %.
DETAILED DESCRIPTION OF THE INVENTION
The invention will be described in detail as follows.
It is essential that n is within a range of 1-8 in polyalkylenepolyamines expressed by the above-mentioned general formula (A)
H
2
N[(CH
2
)
m
NH]
n
(CH
2
)
m
NH
2
(A).
There may be exemplified polyethylenepolyamines such as diethylenetriamine, triethylenetetramine, tetraethylenepentamine, pentaethylenehexamine and octaetylenenonamine; dipropylenetriamine, tripropylenetetramine, tetrapropylenepentamine and pentapropylenehexamine, wherein n is most preferably 4-6 from the viewpoint of effects.
As saturated or unsaturated fatty acids having 8-22 carbon atoms to be reacted with the above-mentioned polyalkylenepolyamines, any of capric acid, coconut fatty acid, lauric acid, myristic acid, palmitic acid, stearic acid, behenic acid, oleic acid, linolic acid and tall oil fatty acid may be effective, wherein saturated or unsaturated fatty acids having 16-18 carbon atoms such as palmitic acid, stearic acid, oleic acid and linolic acid are most preferable from the viewpoint of effects.
Further, from 1 mole to (n+1) moles of the saturated or unsaturated fatty acid having 8-22 carbon atoms is reacted with 1 mole of the above-mentioned polyalkylenepolyamine, wherein it is effective that 1-2 mole(s) of the fatty acid is reacted with 1 mole of polyalkylenepolyamine for the case of n being 1-3 in the polyalkylenepolyamine, that 2-3 moles of the fatty acid is reacted with 1 mole of polyalkylenepolyamine for the case of n being 4-6 in the polyalkylenepolyamine, and that 2-4 moles of the fatty acid is reacted with 1 mole of polyalkylenepolyamine for the case of n being 7-8 in the polyalkylenepolyamine.
Further, as modified polyolefin resins having carboxyl groups having an acid number of 5-100 to be used in the invention, there maybe examplified oxidized polyethylene wax, oxidized polypropylene wax, ethylene-acrylic acid copolymer, ethylene-methacrylic acid copolymer, ethylene-maleic acid (anhydride) copolymer, propylene-maleic acid (anhydride) copolymer, ethylene-itaconic acid (anhydride) copolymer and mixtures of two or more these resins, wherein it is preferable that the acid value thereof is within a range of 5-100 mg KOH/g. It is particularly preferable for a peeling resistance-effect that the acid value is 20-50 mg KOH/g, and it is most preferable that the modified polyolefin resins are oxidized polyethylene wax and oxidized polypropylene wax.
Further, for the composition according to the invention of (B) a condensate obtained by reacting 1 mole of the above-mentioned polyalkylenepolyamine with from 1 mole to (n+1) moles of a saturated or unsaturated fatty acid having 8-22 carbon atoms and (C) a modified polyolefin resin having carboxyl groups with an acid value of 5-100, it is essential that the blending proportion is (B):(C)=95:5-5:95 (weight %). It is particularly effective that the blending proportion is (B):(C)≈80:20-40:60 (weight %).
The composition according to the invention can be obtained easily by condensing (dehydrating) the above-mentioned polyalkylenepolyamine with the higher fatty acid in the presence of an alkali catalyst such as caustic soda and caustic potash by a known method to obtain condensed polyalkylenepolyamine fatty acid amide or condensed alkyl/alkenyl imidazoline compound, and thereafter mixing it with the modified polyolefin resin having carboxyl groups with heating.
Thus, the obtained composition according to the invention can provide extremely superior peeling resist
Ando Seitaro
Goto Tadao
Hagiwara Sadao
Miyauchi Haruyoshi
Oliff & Berridg,e PLC
Sanders Kriellion A.
Toho Chemical Industry Co., Ltd.
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