Adhesive and laminate prepared using the adhesive
It is an object of the invention to provide a carbodiimide modified polyolefin adhesive having excellent adhesive strength in a room temperature atmosphere and excellent adhesive strength in a high temperature atmosphere even in continuously molding with a practical molding machine. An adhesive (D), i.e., a carbodiimide modified polyolefin adhesive of the present invention which can solve the above problem is obtainable by allowing a polyolefin (A) having a group capable of reacting with a carbodiimide group to react with a carbodiimide group-containing compound (B) in the presence of an unmodified polyolefin (C) and having a ratio of a peak intensity at 2130 to 2140 cm −1 to a peak intensity at 1470 cm −1 , as determined by infrared absorbance analysis, of not more than 60% and a density of 0.870 g/cm 3 to 0.920 g/cm 3 . Furthermore, the use of the adhesive provides a laminate of a polar resin (F) and a polyolefin (G) having excellent interlaminar adhesive force both under a room temperature atmosphere and under a high temperature atmosphere.
1. A multi-layered laminate obtainable by bonding a polar resin (F) and a polyolefin (G) or at least two kinds of polar resins (F) through an adhesive (D), wherein the adhesive (D) is obtainable by allowing a polyolefin (A) having a group capable of reacting with a carbodiimide group to react with a carbodiimide group-containing compound (B) in the presence of an unmodified polyolefin (C), which adhesive has a ratio of a peak intensity at 2130 to 2140 cm −1 to a peak intensity at 1470 cm −1 , as determined by infrared absorbance analysis, of not more than 60% and a density of 0.870 g/cm 3 to 0.920 g/cm 3 .
2. The multi-layered laminate according to claim 1 , wherein the adhesive (D) has a flexural modulus of from 70 to 180 MPa.
3. The multi-layered laminate according to claim 1 , wherein the polyolefin (A) having a group capable of reacting with a carbodiimide group has a density of from 0.915 to 0.980 g/cm 3 .
4. The multi-layered laminate according to claim 1 , wherein the adhesive (D) further comprises at least one substance (E) capable of giving tackiness selected from rosin derivatives, terpene resins, petroleum resins and hydrides thereof.