A type of natural resin. Some are fossilized or semi-fossilized, and some are secreted from living trees, and there are various ways to extract them. Raw copal is highly soluble and is dissolved in alcohol, benzol, or turpentine to use as varnish or adhesive. In general, copal is hard, durable, abrasion-resistant, and chemical-resistant, so varnishes containing copal are highly valued as luxury items. Fossil resin, or copal close to semi-fossil resin, is dissolved by heating before use. Many are called Congo copal, Manila copal, etc., after the name of the land where they are produced. Source: Encyclopaedia Britannica Concise Encyclopedia About Encyclopaedia Britannica Concise Encyclopedia Information |
天然樹脂の一つ。化石化,半化石化したものや現存樹木から分泌されるものもあり,採取方法はさまざま。生コーパルは溶解性が大きくアルコール,ベンゾール,テレビン油に溶かしてワニス,接着剤に用いる。一般にコーパルは硬度,耐久性,耐摩耗性,耐薬品性を有するため,コーパルを配合したワニスは高級品として重用される。化石樹脂,または半化石樹脂に近いコーパルは一度熱溶解してから使う。多くは産出する土地の名称でコンゴコーパル,マニラコーパルなどと呼ばれる。
出典 ブリタニカ国際大百科事典 小項目事典ブリタニカ国際大百科事典 小項目事典について 情報 |
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